Compulsory programmatic requirement for current versions of Kaspersky Lab anti-virus products is presence in the Microsoft .NET Framework 4.0 system. Due to the absence of this component or its incorrect operation, Kaspersky Anti-Virus may not install, start up with a "white window", etc.

To fix errors in the Microsoft .NET Framework, run:

1. Download and run Microsoft .NET Framework Repair Tool- a utility for diagnosing and fixing problems in the Microsoft .NET Framework.
   Follow the program installer steps, and then restart your computer.
2. Try to install the Kaspersky Lab product again.

3. If the problem cannot be fixed using the Microsoft .NET Framework Repair Tool, reinstall .Net Framework:

• Uninstall the program using standard means Windows:
  for Windows prior to version 10, open Start > Control Panel > Add/Remove Programs;
  for Windows 10 - Win + X > Control Panel > Programs and Features > Turn Windows features on or off > uncheck .Net Framework components > Ok
• Once uninstalled, download and install the latest version of .Net Framework.

4. If this recommendation did not help, then:
open command prompt (cmd) as administrator (Win + X - command prompt (administrator)), enter in turn:
dism.exe /online /cleanup-image /scanhealth press Enter
dism.exe /online /cleanup-image /restorehealth press Enter
sfc /scannow press Enter

During the launch of some program or at the start of Windows 7 and higher, the user may encounter an error in initializing the .NET Framework 4 platform. It occurs due to incorrect installation of this component or during incompatibility with the operating system itself. Therefore, in order to solve it, it is worth considering several methods.

Ways to solve the NET Framework initialization problem

When you run the application on a PC running Windows 7 or later, you may receive a message stating "This application must first install one of the following versions of NET Framework...". In this case, the version of the framework is always indicated.

To solve this problem yourself, you should read the following recommendations.

Method 1: Reinstall the .NET Framework

• Go to the Control Panel and select "Programs and Features".

• A small window will open. Select "Turn Windows features on or off" from the menu on the left. We find in the list and disable frameworks.

• After we return to the list of programs and find the .NET Framework there. We also remove them. We delete everything that is on the PC.

• After removing all installed components, it is worth rebooting the system.

Now that the system has been cleared of all frameworks, go to the official Microsoft website and click Download the .NET Framework of the version indicated in the error. After downloading the required component, we install it and restart the PC again.

Method 2: Use Official Utilities to Resolve Issues with the .NET Framework

To fix problems with frameworks, Microsoft has released several utilities. Consider the principle of their work in practice.

The first utility is Microsoft .NET Framework Repair Tool. She searches for and fixes problems that are related to frameworks.

To apply it, you should download the file, run it on your PC and accept the terms of the license agreement.

After that, the program will scan the system and offer options for solving the problem. Click "Next" and fix the error.

The second program to solve the file initialization error is the .NET Framework Setup Verification Tool. It checks if the frameworks are installed correctly. At the same time, its use is as simple as possible. You need to download and run the program, specify the version of the frameworks that you want to check and wait for the check results to complete.

The results of the check will be placed in the "Status" field.

The third utility for fixing errors with the .NET Framework is the .NET Framework Cleanup Tool. It will come in handy if you were unable to reinstall the frameworks manually. The utility allows you to remove, re-download and correctly install the missing components.

Therefore, if you yourself were unable to reinstall the frameworks and solve the problem with initializing files, utilities from Microsoft can help solve this problem.

For those who have even the slightest understanding of computer software, it is absolutely clear that in any case there comes a time when it becomes necessary to install NET.Framework.

Users often have problems installing and using NET.Framework

This is not surprising at all, since NET.Framework is a framework upon which you can build and then subsequently run some applications. Since Microsoft is the developer of such a platform, it is certainly designed for Windows, although it is still possible to install NET.Framework on some other operating systems, including Linux.

Unfortunately, the installation of the platform is not always successful, users have to face serious problems when system errors occur, due to which the installation process ends with a sudden failure.

Of course, the question immediately arises why Microsoft NET Framework 4 is not installed. Having received an answer to this question, you can find ways to fix the problem.

Inexperienced users who have heard about the possible errors that occur when installing NET.Framework want to know if it is possible to do without installing such a package on a computer. In principle, there is no need to immediately overload the operating system with all sorts of additional applications and programs if the user does not need them. Programmers recommend installing only software that the user directly needs. Excessive loading of the OS with unnecessary programs provokes a shortage of free space on the hard disk, which worsens both the operation of the system and its performance.

By the way, Microsoft initially bundled NET.Framework into the Windows 7 installation package. In addition, the loading of the platform can also be automatically carried out if the user wants to install some game applications, since in this case, the game developers foresee that the game will not be launched without such a platform. In order not to bother the user with additional searches, the installation of the platform is immediately embedded in the game's boot file.

Encountered errors

Having understood the algorithm for installing new software, users, by analogy, proceed to install NET.Framework on Windows 7. By performing all the proposed steps in sequence, the user reassures himself that everything will go smoothly, and soon the platform will be successfully installed on Windows 7, after which you can immediately start downloading and then launching your favorite game.

However, in some cases, disappointment arises, because you have to face the fact that even if you strictly follow the instructions, the NET Framework 4 Windows 7 still does not install, displaying a “sad” message on the screen.

The most common cause is a conflict situation that occurs in Windows 7.

Microsoft confirms that the problem that does not install NO Framework 4 on Windows 7 is indeed related to Windows Update.

Of course, if a problem arises, then there is someone who is trying to find ways to solve it. So in this case, programmers have already found effective ways to get around the error that occurs by successfully installing NET.Framework on Windows 7.

At the same time, there is no need to do something incredible, the algorithm for fixing the problem is described in detail, so even those who do not have sufficient practical experience can master it.

How to install NET.Framework

"I can't install the NET Framework" is a phrase that many users hear. The combination “I can’t” just flooded thematic forums. Fortunately, there are programmers who, thanks to their excellent knowledge and practical skills, are able to find various options for eliminating errors. In addition, they do not hide their brilliant “finds”, but are happy to share with everyone, so on the forums you can often find valuable advice that allows even absolute “dummies” to solve problems.

Algorithm of actions focused on the installation of the platform

To install NET.Framework on Windows 7, you must first remove all previous installation traces of all versions. It is quite difficult for inexperienced users to do such manipulations, since Microsoft has tightly “intertwined” the system folders with the platform folders. For this reason, the previous version can be very difficult to remove, or, in general, there is no way to "get rid of" it.

You can’t ignore this step either, because during the new installation of the platform on Windows 7, an error may occur again.

In order for the entire process of uninstallation and subsequent installation to be successful, it is important to follow all the recommendations of experienced users. First of all, it is recommended to download the dotnetfx_cleanup_tool.zip file. Next, it should be opened, and then immediately extracted, since it is placed in the archive.

In the folder where all the extracted files are located, you need to find the cleanup_tool file with the .exe extension. That is what should be launched. A new window will immediately appear asking permission for all subsequent actions. By clicking on the "Yes" button, the user agrees with everything, so the program continues to perform all other actions.

At some point, a window will appear in which you will be offered the right to select the Microsoft product that you want to remove. Among the proposed list there is a line "NET.Framework - all versions", selecting it, it remains to click on the "Clear" button.

However, such an application is not omnipotent, since it will not be able to remove NET.Framework 2.0, since this version of the framework is defined by Microsoft developers as an integral part of the operating system.

After cleaning is completed, the computer must be restarted. Microsoft developers put forward such requirements for many important procedures related to the installation and uninstallation processes.

After starting the operating system, install several versions of Microsoft.NET.Framework in sequence. Initially version 1.1, then go to the installation of versions 3.5 and 3.0, then again you will need to restart the computer.

In conclusion, it remains to enable Windows Update and after that safely install Microsoft.NET.Framework 4.

Despite the fact that it will take some time to perform all the indicated actions, the user can definitely be proud of the result. New knowledge, supported by practical skills, is always considered as a “golden treasure”, which can be useful many more times.

So, despite some difficulties, every user can install the NET.Framework 4 platform on a computer if he believes in his own strength and follows the recommendations of experienced users.

Microsoft .NET Framework is a necessary component for the operation of many programs and games. It is perfectly compatible with Windows and most applications. Malfunctions in his work do not occur often, but still this can happen.

When installing a new application, users may see a window with the following content: ".NET Framework Error, Unhandled Exception in Application". When you press a button "Continue", the installed software will try to launch ignoring the error, but still will not work correctly.

Why does an unhandled exception occur in a Microsoft .NET Framework application?

I want to say right away that if this problem appeared after installing new software, then it is in it, and not in the Microsoft .NET Framework component itself.

Requirements for installing a new application

After installing, for example, a new game, you may see an error warning window. The first thing to do in this case is to check the conditions for installing the game. Quite often, programs use additional components for their work. It can be DirectX, C++ library and more.

Check if you have them. If not, install by downloading distributions from the official site. It may be that the component versions are outdated and need to be updated. We also go to the manufacturer's website and download new ones.

Or we can do it with the help of special tools that update programs automatically. For example, there is a small SUMo utility that will help you easily solve this problem.

Reinstalling the Microsoft .NET Framework

To resolve the error, you can try reinstalling the Microsoft .NET Framework component.
We go to the official website and download the current version. Then we remove the previous Microsoft .NET Framework from the computer. Using the standard Windows wizard will not be enough. For a complete removal, it is necessary to involve other programs that clean the remaining files and system registry entries from the system. I do this with CCleaner.

After removing the component, we can install the Microsoft .NET Framework again.

Reinstalling the program giving the error

The same should be done with the program that caused the error. Be sure to download it from the official site. Removal by the same principle, through CCleaner.

Using Russian characters

Many games and programs do not accept Russian characters. If your system has folders with a Russian name, then they must be changed to English. The best option is to look in the program settings where information from the game is thrown. And not only the final folder is important, but the whole path.

You can use another method. In the same game settings, change the file storage location. Create a new folder in English or select an existing one. As in the first case, we look at the path. To be sure, we reboot the computer and restart the application.

Drivers

The correct operation of many programs and games directly depends on the state of the drivers. If they are outdated or not present at all, failures can occur, including an unhandled exception error in a .NET Framework application.

You can view the status of the drivers in the task manager. In the properties of the equipment, go to the tab "Driver" and click update. To perform this task, your computer must have an active Internet connection.

In order not to do this manually, you can use programs to automatically update drivers. I like Driver Genius. You need to scan your computer for outdated drivers and update the necessary ones.

Then the computer should be rebooted.

System requirements

Very often, users install programs without delving into their minimum system requirements. In this case, too, an unhandled application error and many others may occur.
Look at the installation requirements for your program and compare with yours. You can see it in properties. "My computer".

If this is the reason, you can try installing an earlier version of the program, they are usually less demanding on the system.

Priority

Another cause of errors in the .NET Framework can be the processor. While working with a computer, various processes are constantly started and stopped, which have different priorities.

To solve the problem, you need to go to "Task Manager" and in the processes tab, find the one that matches your game. By clicking on it with the right mouse button, an additional list will appear. It needs to find "Priority" and set the value there "High". Thus, the performance of the process will increase and the error may disappear. The only disadvantage of the method is that the performance of other programs will decrease somewhat.

We've covered the most popular issues when a .NET Framework error occurs "Unhandled Exception in Application". Although the problem is not common, it causes a lot of trouble. If none of the options helped, you can write to the support service of the program or game that you installed.

Microsoft .NET Framework is the so-called software platform. The installation of the NET Framework is required to run programs written on this platform. To make it clearer to you, I will explain as follows: some video files will not play on Windows if they do not have the necessary codecs installed. The situation is the same here: programs written under the NET Framework will not be able to run if this component is not installed on the system.

An important point: for the operation of an application written for a specific version of the NET Framework, this version must be installed.

Microsoft released the first version of the NET Framework back in 2000, and since then there have been several (NET Framework 1.0, 1.1, 2.0, 3.0, 3.5, 4.0, 4.5).

So how do you know which versions of the NET Framework are installed on your computer?

Microsoft .NET Framework 4.5.1
It is an update of versions 4.0 and 4.5, so if 4.5.1 is installed, then these versions do not need to be installed. Windows XP is not supported by NET Framework 4.5.

How to reinstall Microsoft .NET Framework?

Sometimes there are problems in the system, one way or another related to the NET Framework. For example, errors appear when starting some programs or when installing (updating) the Microsoft .NET Framework itself. In this case, the most reliable solution to the problems is to remove the platform and reinstall it.

To correctly uninstall NET Framework from your computer, it is best to use a program specially created for this .NET Framework Cleanup Tool.

Download it, then unzip the archive and run the file cleanup_tool.exe.

A message will appear: “Do you want to run the .NET Framework Setup Cleanup Utility?” (although in English) - click "Yes". Then accept the terms of the license agreement (“Yes” button).
In the program window, select “.NET Framework - All Versions” from the list and click the “Cleanup Now” button:
After uninstalling NET Framework, restart your computer. Then reinstall the desired versions, starting with the smallest.