Blue screen errors, please help before I kick it!!Follow

Hey guys, I just built a new PC, the specs are:

ASUS P5WD2 Premium Motherboard
Intel Pentium 4 3.2 Ghz 800FSB
2Gb DDR2 PC533 RAM
GeCube Radeon X700 256Mb (PCI Express)


After building it, it ran fine, windows XP install was normal. I imediatly installed Service pack 1 and 2 and all drivers. Worked fine for a week or two and ran Doom 3 with no lag on full graphics quality.

I have been playing Star Wars: KOTOR 2 on it, also with no problems. Until the game crashed and exited to desktop. I restarted the game and had horrible graphical glitches, and after about 5 seconds it crashed, this time restarting the PC.
Ever since then, I cannot turn the PC on without a blue screen 3 seconds after booting to windows desktop. They range from "page fault in nonpaged area" to "irq not less or equal" errors.

I am SO PISSED OFF, so please, ANYONE help me!

Thanx, Ill try that memtest thing. It seems to work fine after I set the system to manage the pagefile, but its worth checking.