Resolution of the CLR20r3 error in Windows 7

Running third-party programs in Windows requires that the system have the necessary components and that they work properly. If one of the rules is violated, several errors will inevitably occur that will prevent the application from continuing to function. In this article we will talk about one of them with the code CLR20r3.

CLR20r3 error correction

There are several reasons that cause this error, but the main one is the malfunction of the .NET Framework component, the lack of version or its total absence. It can also be caused by a virus attack or by defects in the system files responsible for the functionality of the corresponding system components. The following instructions must be followed in the order in which they are aligned.

Method 1: Restore the system

This method will be effective if the problems started after installing Windows programs, drivers, or updates. The main thing here is to correctly determine the cause of this behavior and then select the correct restore point.

Read more: How to recover Windows 7

Method 2: Troubleshoot updates

If the failure occurred after a system update, it is likely that the process ended with errors. In such a situation, you need to eliminate the factors that affect the success of the operation, and if unsuccessful, install the necessary packages manually.

Read More:
Why won't the updates install in Windows 7?
Manually install Windows 7 updates

Method 3: Troubleshooting the .NET Framework

As we wrote earlier, this is the main cause of the failure discussed. This component is vital for some programs in order to enable all the features or just to be able to run on Windows. The factors that affect the operation of the .NET Framework are varied. They are the actions of the virus or the user himself, the incorrect update and also the mismatch between the installed version and the software requirements. You can resolve the problem by checking the revision of the component and reinstalling or updating it.

Read More:
How to find out the version of the .NET Framework
How to update the .NET Framework
How to uninstall the .NET Framework
The .NET Framework 4 is not installed: how to fix the problem

Method 4: Check for Viruses

If the above methods do not help to get rid of the error, you should check your PC for viruses that may be blocking the execution of the program code. You should also do this if the problem has been eliminated, because pests could have caused it in the first place by corrupting files or changing system settings.

More information: Fighting computer viruses

Method 5: Restore system files

This is the last resort to fix the CLR20r3 error, the only thing that follows is to reinstall the system. Windows has a built-in SFC.EXE utility that has the function of protecting and restoring corrupted or lost system files. Run it from the "Command Prompt" under a running system or in the recovery environment.

There is an important nuance here: if you use an unofficial (pirated) compilation of "Windows", this procedure may completely deprive it of its operability.

Read More:
Checking the integrity of system files in Windows 7
Restoring system files in Windows 7


Fixing the CLR20r3 error can be quite difficult, especially if viruses have installed themselves on your computer. However, in your situation it may not be so serious and you can update the .NET Framework, which is the most common. If neither method helps, unfortunately, you will have to reinstall Windows.

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