Computer randomly restarts on a blue screen!

Hi I recently installed Windows 7 Ultimate on my computer and at first I didn't have any issues. It was running on Crossfire ATI HD 4870 and then I switched back to a single HD4870 due to overheating and then thi problem started: I randomly get a blue screen and then the computer restarts, no matter what I'm doing!
This is the error report I managed to get somehow:

"Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.1.7600.
Locale ID: 2057

Additional information about the problem:
BCCode: c2
BCP1: 00000099
BCP2: 85722B28
BCP3: 00000000
BCP4: 00000000
OS Version: 6_1_7600
Service Pack: 0_0
Product: 256_1

Files that help describe the problem:

Any advice??
My computer specifications are:

Operating System:
MS Windows 7 Ultimate 32-bit

Intel Core 2 Duo E8400 @ 3.00GHz
Wolfdale 45nm Technology

4.0GB Dual-Channel DDR2 @ 400MHz 5-5-5-15

ASUSTeK Computer INC. P5KC (LGA775)

VX2260WM @ 1920x1080
ATI Radeon HD 4800 Series (Sapphire/PCPartner)

Hard Drives
500GB Western Digital WDC WD5000AAKS-75YGA0 ATA Device (IDE)

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More about computer randomly restarts blue screen
  1. Windows 7 is very memory sensitive, a computer that runs Windows XP without any problems can fail when running Windows 7 if it has memory problems. Try running memtest86 overnight. If the memory test fails at the same location then the problem is with the memory but if it fails at random locations then the power supply is suspect. If the memory test shows no problems then I would suspect the video drivers.
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