"IRQL_NOT_LESS_OR_NOT_EQUAL"

[Tim Arnold]

I recently purchased a number of new pc components and
assembled them myself. Had a few troubles with Serial ATA
HDD but eventually ironed them out and got Windows XP up
and running.

Asus A7V600 Socket A motherboard
AMD Athlon XP 2800+ Processor
Seagate Serial ATA 120GB 7200RPM 8mb Cache
ASUS V9520VidoeSuite GeForce FX 5200 with TV-in/out
2 x 512M GeIL PC3200 400MHz DDR SDRAM

System ran fine for a few days and then all of a sudden, I
try to boot Windows and receive the following message

"IRQL_NOT_LESS_OR_NOT_EQUAL"

Windows suggests restarting the and running is safe mode;
I have tried this but receive the same error.

Can any advise on:
1. What may have caused this error?
2. How can the problem be overcome?


Thanks in advance to all those that take the time to reply.