Hi Erica-VT,
The .NET Framework has two main components: the common language runtime (CLR)and the .NET Framework class library. The common language runtime is the foundation of the .NET Framework. .NET Framework3.5 uses CLR version 2.0 and so does .NET Framework2.0or 3.0, while .NETframework 1.1 uses v1.1.
All versions of the .NET Framework from 2.0 onwards (i.e. 3.0 and 3.5) use exactly the same core framework files.
Referring toremoval ofthe .NET Framework, it depends on the applications and OS that are ran on your PC.
If you have any application that is based on any .NET Framework, you should not remove it.
For OS, here is a useful blog that shows what version of .NET Framework is included in what version of OS. See:
http://blogs.msdn.com/astebner/archive/2007/03/14/mailbag-what-version-of-the-net-framework-is-included-in-what-version-of-the-os.aspxIf you're not surewhether you need them for applications or OS, I also suggest you to keep all the versions.
Hope this helps. If you have any concern, please feel free to let me know.
Best regards,
Yichun Chen
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