How can I remove a copy of .NET Framework 2.0?

I have recently had a Virus attack.  After cleaning up the virus I had problems with a number of my programs including WindowXP Pro so I reinstalled WindowsXP without doing a complete reinstall.  Everything started working.  I then went to the Microsoft Update site and installed all the updates but one fails.  Microsoft .Net Framework 2.0 the problem I think is that I had the 2.0 frame work already installed as I can see it in the  Administrator Level but when I went to remove it so I could reinstall it the Add and Remove programs does not show where to remove it.  My question is   Is there a MS KB artical on removing the .NET Framework 2.0 so I can reinstall it

Cheers

Canman2