>"Within hours of its release, Microsoft's Service Pack 3 for Windows XP began drawing hundreds of complaints from users who claim the update is wreaking havoc on their PCs from spontaneous reboots to outright system crashes.

"My external disks are having trouble starting up, which results in Windows not starting up. After three attempts to install XP SP3 with different configurations each time, System Restore was the only way to get me out of deep shit." Another user said the service pack prevented him from starting his computer. "I downloaded and installed Windows XP Service Pack 3."Now I can't get the computer to boot."

Dozens of other posters reported similar problems. "

http://www.informationweek.com/news/windows/operatingsystems/showArticle.jhtml?articleID=207600950