We pushed out about 4 months of updates through our WSUS server this week along with Windows XP SP3. On about 15% of the machines that install these updates we get the following problem.
-Regular windows stalls at XP splash Screen (progress bar is empty and dimly lit as it freezes just after it starts to appear).
-Safe mode stalls at mup.sys
-When booting from Windows XP SP2 cd it stalls at "Setup is starting Windows" (Since I cant get past this point I cant even wipe the hard drive).
On one machine I was able to boot into safe mode after waiting 20 minutes at mup.sys. After removing the hard drive and plugging it into another system as a slave, I attempted to follow the system restore instructions found at: http://support.microsoft.com/default.aspx?scid=kb;en-us;Q307545
which did not work.
The last machine this happened to I actually had control of before the problem showed as it was in for maintenance. At the time the machine already had XP SP3 installed and I was installing an update to SP3 when the issue started.
I have done some research on the web and found many people with similar issues, but none of the fixes work for me. This has been complicated by the fact that one of these machines is our CEO's. Any help would be greatly appreciated.