from my limitied knowledge...
hp pavillion ze4400
AMD Athlon XP
Windows home XP
The issue: working fine one day, the next not. System keeps rebooting, gives options to safe mode, SM w/ networking, last known good config, etc.
when choosing any of these Windows startup begins (logo, loading bar, etc.) then a blue screen flashes by and the machine reboots.
The exception being that if I choose safe mode some multi disk/rdisk/partition/Windows/system mojo flashes down the black screen. Once I got it to boot into safe mode and started running AVG but it rebooted.