Restarting for no reason and with no warning

[Guest]

My computer has been restarting for no reason for ages. I turned off the
restart option for unexpected system stops and it comes up with a blue screen
instead. i have tried everything:
Added 256mb of ram
New Cpu fan
New power supply

i cant think of anything else.
Help me

 

[gf]

Give the exact text of the blue screen and maybe someone can help you

 

[Guest]

This is the exact message that appears on the blue screen.

A problem has been detected and windows has been shut down to prevent damage
to your computer.

BAD_POOL_CALLER

If this is the first time you've seen this stop error screen, restart your
computer. If this screen appears again, follow these steps:
Check to make sure any new hardware or software is properly installed. If
this is a new installation, ask your hardware or software manufacturer for
any windows updates you may need.

If problems continue, disable or remove any newly installed hardware or
software. Disable BIOS memory options such as caching and shadowing. (then it
talks about safe mode)

Technical Information:

***STOP : 0x000000C2 (0x00000007, 0x00000CD4, 0x00000007, oxE25FA008)

Beginning dump of physical memory.
Physical Memory dump complete.