FYI - We encountered the stop errors listed in the subject when running Windows 2003 x64 SP2 with patch KB932596 on our Exchange 2007 servers. The restarts were random and happened across all of our x64 boxes. MS has a hotfix for the issue which you can request from PSS.
Update to improve kernel patch protection: http://support.microsoft.com/kb/932596 Stop errors after installing KB932596: http://support.microsoft.com/kb/950772 -alex ~ Ninja Email Security with Cloudmark Spam Engine Gets Image Spam ~ ~ http://www.sunbeltsoftware.com/Ninja ~