How to remove .net software and installation

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 v3.0

d) Download Windows Install Cleanup Utility by following the article http://support.microsoft.com/kb/290301 and remove any other versions of .Net framework showing up in cleanup utility.

e) Download the Net Framework cleanup tool
Or you can download the tool from the left side of the page under the section "USEFUL TOOLS".
http://blogs.msdn.com/astebner/pages/8904493.aspx

f) Download and run the tool and select the option "Remove All Versions" and click Remove all and all versions of Net framework will be removed if you have not completely removed Dot Net in previous steps.You may have to restart your computer after this step for the changes to take effect.

g) Download the following files from the links given below and Install them.

http://www.microsoft.com/downloads/details.aspx?familyid=262D25E3-F589-4842-8157-034D1E7CF3A3&displaylang=en
.NET FRAMEWORK 1.1 Service pack 1

http://www.microsoft.com/downloads/details.aspx?familyid=a8f5654f-088e-40b2-bbdb-a83353618b38&displaylang=en
h) Then Visit windows update website and you will get the prompt to install both the updates 928365 and 928366 and install them on the system and this time they will get installed without any issues.

i) Then you can download the latest versions of Net framework like 2.0 and install them if customer wants. Also you can install Net framework 3.0 if its being used by the customer. But make sure you install 2.0