What I would do first is try loading into Safe Mode (F8 while booting, before the XP load screen). Go to safe mode and then reboot...go to safe mode a few times and see if loads ok without issues. Rebooting again into safe mode each time.
If it's loading Safe Mode ok without issue, then it most likely is a driver problem.
Could be just about anything, memory, display card or driver. Sometimes even a faulty power supply can do it. You can narrow down the memory, by taking them all out, try 1 @ a time, in each slot. Although on this particular board it may not post with a single stick of ram in certain slots. I think for single ram useage, it must be inserted in slot4 to post. When using only 2, use slots 2 & 4.
Trying each of them by them self may help you figure out if 1 out of the 2 is possibly bad or not. Can also get memory tester program here for free and test the ram sticks.
Windows Memory DiagnosticIf you not really going to loss anything, I would just do fresh install of XP (besure to wipe the partition when reloading XP)
But if u have alot of important data to backup first, u can do backups in Safe Mode, if you need access to your network or optical drives in safe mode, select Safe Mode with Networking from the F8 menu. This will enable basic network and access to CD/DVD drives.
Need further help you can email or IM me...
alienempyr@hotmail.com
I have mostly all Asus custom-built systems myself...
A8N-SLI-Deluxe / A8N-SLI-Premium / A8N32-SLI-Deluxe