We recently had a client who applied Windows 2003 Server Service Pack 1 on their Dell Poweredge 420SC server. On reboot, they were greeted with the dreaded blue screen of death (BSOD) with the error message.
STOP 0x00000051 (REGISTRY_ERROR)
The server would then reboot and then do it all again. Safe mode and Last Known good configuration made no difference.
After searching the net, it turns out that this is a known problem on older Dell Poweredges that have had a factory install of Windows on.