I've found information on uninstalling most of the .NET Frameworks using Msizap but having trouble uninstalling .NET 3.5 Framework. Some DLLs got corrupted from a recent virus attack and I'm having trouble running some of my .NET 1.1 applications that make use of the entire .NET library. Creating and running a test .NET 1.1 application of just a messagebox seems to work just fine but beyond that it's hosed.
Clean uninstall of all .NET frameworks 1.1-3.5 on Windows XP
netuninstall
Best Answer
You could try the dot net clean up tool. I had to use it once and it worked very well.
Tool
http://cid-27e6a35d1a492af7.skydrive.live.com/self.aspx/Blog_Tools/dotnetfx_cleanup_tool.zip
User Guide
http://blogs.msdn.com/astebner/pages/8904493.aspx