Windows random restart

Hi, i just upgraded my system to windows 7 ultimate and increased my screen resolution to 1600 x 900 my monitors recommended resolution. Ever since i upgraded it, my computer will randomly shut down and when it starts back up I get the windwos has recovered from an unexpected shut down and when i click on view details this is what i see.

Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.1.7600.2.0.0.256.1
Locale ID: 1033

Additional information about the problem:
BCCode: 3b
BCP1: 00000000C0000005
BCP2: FFFFF88004909817
BCP3: FFFFF8800823E900
BCP4: 0000000000000000
OS Version: 6_1_7600
Service Pack: 0_0
Product: 256_1

Files that help describe the problem:
C:\Windows\Minidump\122210-43352-01.dmp
C:\Users\Chad\AppData\Local\Temp\WER-83741-0.sysdata.xml

Also whenever i restart my computer my screen resolution drops back down to 1200 x 720. anyone have any ideas?

I have an intel Q8200, 8 gigs or ram, and an ati HD 5770. The only thing i upgraded on this system was windows.
 
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