As a last resort, you can reinstall the .NET Framework. This problem can also occur due to the improper installation of the Microsoft .NET Framework. Therefore, clean up Microsoft .NET Framework ...

What is the "Microsoft .NET Framework" and why do I need it? I've been trying to install BlackBerry Desktop, but it fails and states I'm missing the Framework. For some reason I can't download it ...

This web page contains information about the Add or Remove Programs control panel entry - Microsoft .NET Framework 1.1 Hotfix (KB925168). More information can be found by visiting this search result.

If you need to .NET Framework 2.0 or 3.0 and already have .NET Framework 3.5, you can use the desired program without further installation. Read: Fix 0x800F0922 .NET Framework installation error ...