NET versions 4.0, 3.5, 2.0, and 1.1 installed, first remove 4.0 then 3.5, then 2.0, and finally 1.1.

Be sure to remove the latest version first.

See link in Additional Information below for steps. NET Framework from Windows using Programs and Features in the Windows Control Panel.

Remove all existing versions of the Microsoft.For instructions on using System File Checker, please refer to Microsoft KB Article ID 929833. If any issues are discovered, those must be addressed before continuing. Run the Windows System File Checker tool.If it failed, contact local IT personnel for additional help. It will end with a message that the update was either successful or failed. It can take a while based on internet speed. At this point, Windows will download an update to the.Browse back out to Programs and Features.Close Programs and Features window and restart the machine.On the left side, click on Turn Windows features on or off.

Browse out to Programs and Features in Control Panel.NET framework from Windows 8 and above, but there is a procedure to force an update.

Dotnet framework cleanup tool