I have seen this as well, but have not tried it. The last time I tried to update my computer to SP2 I ended up having to reformat my computer and ended up losing a lot of important programs. I am afraid to update my window's software now.
I installed the software following the instructions, so I don't really know what went wrong. I know that I did lose many programs and important stuff off of my laptop though and my computer would barely function afterwards.