There should be a government PC health warning with SP2.
I have a very reliable computer which has never missed a beat, but after a week, decided to install sp2.
After it loaded, it rebooted and then failed to load. I tried... safe mode last best configuration resetting bios changing hardware slowing down pc speed used xp disk to repair, blew over fresh install
I had to reinstall a fresh copy and then then all was back to normal.
When you look at what sp2 actually does, you wonder whether its worth the risk. What will it do that a good firewall and Norton securities won't do.
I expect this is just another set of bloatware launched by Bill which slowly over a course of a year makes your pc run slower...slower and slower. so you have to upgrade to a faster processor and his next new o/s.
Yes! I am bitter, but so would anyone who has experienced this problem. Where was the warning? Nothing!
SP2 is more than just the Security Center and a new firewall. It also beefs up IE security and fixes a lot of Windows vulnerabilities. Some people have had problems installing ordinary security patches. There's always a risk, but considering the number of people who install these things successfully it's a small one. Not that that's much compensation if you're one of the unlucky few, I suppose. :)
FWIW I installed it on 3 computers. My Toshiba laptop ran like treacle afterwards so I used the factory restore disk to take it back to its original state and then did the update again, and it now runs better than it did pre-update.