Blue Screen of Death while playing Starcraft II (NVIDIA 8800GT)

Hello,
I have an older machine that I put together a few years back. For the most part, it is reliable but recently I purchased Star Craft II and getting the blue screen of death or video crashes during play.

My machine is as follows:
OS: Windows Vista 64 Home Premium Edition Service Pack 2
CPU: Intel Core 2 Quad Q6600
Motherboard: ASUS P5N-D (Chipset NVIDIA nForce 750i SLI SPP)
Video Card: NVIDIA GeForce 8800 GT (PCI-e 2.0; 512 MB Memory)
RAM: Four Kingston DDR2 2GB sticks (8GB total)
Power Supply: At least 600 Watt; maybe an 800 Watt; I lost receipt and do not want to take everything out to get to text
Case: Antec 900 (all fans are functional)

I updated video card drivers with a clean install and it worked for awhile (had a few solid hours of play for a few nights with no issues), then the problem started again. I also did things the video game suggested like capping frame-rate in variables.txt, reducing graphics, taking out and cleaning dust off video card, etc. I also monitored temperatures and when the machine reboots (few minutes later), the GPU temps are in the mid-60 range (well under 100 maximum). I also ran the game repair tool and that seemed to help.

If it is not the game, I’m thinking it's the video card. I guess my power supply could also be the culprit as the problem only happens in game, never when checking emails, doing bills, etc. but it’s worked with this card for years. I also installed a USB 3.0 card recently that has had a tough time with driver installs. It says it did not install, yet it functions. I do not think it is the card, but maybe something else causing my computer not to see hardware?

So, with this system, what is the best video card that is compatible with MB and CPU (as well as Start Craft 2)? I do not want to invest a lot of money since my computer is old and I may need to buy a new system. I’d hate to be stuck with an older card if I upgrade my entire system but if I am going to go through the trouble, I'd like a better card.

So, how can I verify for sure it is the video card and not a motherboard or power supply problem?

Here is the error message I get when I recover from crash:

Windows has recovered from an unexpected shutdown

Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.0.6002.2.2.0.768.3
Locale ID: 1033

Additional information about the problem:
BCCode: 116
BCP1: FFFFFA800EA5F3F0
BCP2: FFFFFA6003AF3700
BCP3: FFFFFFFFC000009A
BCP4: 0000000000000004
OS Version: 6_0_6002
Service Pack: 2_0
Product: 768_1

Files that help describe the problem:
C:\Windows\Minidump\Mini071013-01.dmp
C:\Users\Jacob Collins\AppData\Local\Temp\WER-259070-0.sysdata.xml
C:\Users\Jacob Collins\AppData\Local\Temp\WERF6EB.tmp.version.txt

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