what is the correct newsgroup to ask how to uninstall .net 4

I had to run a program to test something, and it needed .net 4 to run.
So after all the install things finished I got to run the test program.

later during the MS updates process the .net4 updates failed many times
to update.

So I thought, lets just delete it and start over. No Can Do, it fails to
uninstall just like it fails to update.

thanks