.Net Framework issues

a) Go to add/remove programs. Click the "show updates" checkbox at the top if you are running Sp2. Remove any versions of .Net framwork showing up.
b) If the above steps fail, go ahead and rename the folder C:\WINDOWS\Microsoft.NET\Framework\v1.1.4322 to C:\WINDOWS\Microsoft.NET\Framework\v1.1.4322old.
c) Delete the following registry keys if they are present: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework\PendingUpdates\v1.1.4322

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\v1.1.4322

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework\policy\v1.1 and v2.0 and v3.0D)

d) Download Windows Install Cleanup Utility and remove any other versions of .Net framework

e) Reinstall .Net Framework from:
i) Microsoft .NET Framework Version 1.1

ii) Microsoft .NET Framework 1.1 Service Pack 1