I have a Dell XP 420 desktop with a fresh reload of Vista 32-bit. Upon successful install of the OS and drivers, it crashes when a pre-downloaded copy of Service Pack 1 is installed. The same predownloaded file has been used several times on other systems, and has been successful. The bios has been updated to the latest version from Dell's site.
I believe Windows 7 SP1 experienced the same issue, and we have already tried a different hard drive, as it was also determind the hard drive (although it was new) was failing.