Hi, NGC,
Sorry to hear you're experiencing this issue.
Usually, this problem is caused by corrupted files on Windows. You can use these commands to find and repair the corrupted files.
1-Right-Click on Start then click on Windows Powershell (admin)
2- Type these commands.
sfc /scannow (and press Enter)
Dism /Online /Cleanup-Image /ScanHealth (and press Enter)
Dism /Online /Cleanup-Image /CheckHealth (and press Enter)
3- The DISM tool will report whether the image is healthy, repairable, or non-repairable. If the image is repairable, you can use the /RestoreHealth argument to repair the image.
4-Type this command and press Enter:
Dism /Online /Cleanup-Image /RestoreHealth
Then you can use the .NET Framework Repair Tool, this tool detects and tries to fix some frequently occurring issues with the setup of Microsoft .NET Framework or with updates to the Microsoft .NET Framework. You can download the .NET Framework Repair Tool at this link.
https://www.microsoft.com/en-us/download/detail...
I hope this information helps. If you have any questions, please let me know and I'll be glad to assist you further.