Removing Service Pack 2

I've dealt with some software recently that said it required Service Pack 2. So, with teeth gritted, yesterday I backed up my computer and installed it. At first everything went fine, but then a new day dawned. Now everytime I start up my computer, I get blue screened. If I restart, it's fine. Also, it now takes my wireless card a loooong time to connect to the Internet.

Any thoughts on getting around this or uninstalling SP2?

EDIT: Figured out how to remove it; wasn't hard and the computer is running better again