need help troubleshooting BSOD

Hello everyone,
I have this reoccuring BSOD,that I cant seem to figure out what is it caused by,so if anyone could help me out a bit a would be very thankfull.I have ruled out faulty RAM as possible problem,ran memtest86 for a night.VGA is also out of the suspects.
There are also trouble with dumps,since windows dont always make any.BSOD’s most of the time happen at night when I’m not using the pc intensively,so I dont think It can be overheating CPU or underpowered PSU.I’m thinking a driver.But witch one?I cant figure out,maybe any of you could?
Thanks in advance
the dumps:
http://www.2shared.com/file/2786409/cabc1ad3/New_Folder.html