Crashing issue

[darkangelism]

I am having a weird crashing issue on my system i keep getting blue screens with error codes 0x000000d1 and 0x000000a IRQL not less or equal errors. These on seem to occur when im not using the system if i leave it sitting on and leave when i come back its at the stop screen, It used to just reboot, but i disabled auto reboot. If i am using the system it doesnt give any errors and will stay up for the 12-15 hours that i use it, but once i go to bed or leave it might stay up 15 minutes or 4 hours then crash...sometimes it wont for 3 or 4 days and sometimes it will crash more then once in a day.

 

I have had some file system corruption previously and had to reinstall my OS that was about 6 months ago and I was running XP, after reinstall XP is when the issues started...which was about 4 months ago, about 3 weeks ago i had more file courruption and installed vista 64 bit instead of XP and the problems continue.

 

system specs:

 

Vista 64 bit ultimate all patches applied

opteron 170 2.0Ghz dual core OCed to 2.65Ghz

Corsair 4000PT DDR 500MHz @ DDR 486

western digital 32000KS 320GB 16MB cache hard drive

dual XFX 7600XXX GT video cards...nvidia driver 100.65 WHQL

motherboard is DFI Lanparty UT nforce4 SLI-D with 3/14/2006 BIOS

 

The hard drive passes western digital lifeguard diags and i have done multiple chkdsk runs and did a full format when moving to vista, I have also done 15 passes on memtest86+ and 0 errors on there. CPU temps is 35C idle and 41C load but the errors occur during idle activities not under load so I dont think its a heating or OCing issue.

 

the driver file reference nvmcp64.sys