I am curious if event viewer has anything showing that blue screen view might be over looking.
In Windows 7, click on START.
In the search field, type event viewer.
Click on event viewer
in the list of the window that opens.
Check for any errors you see in the upper top window area.
This window will have the heading with the words summary of Administrative events
Look for the following areas listed below, expand them at the + to see what errors happened in the last 24 hours.
You might find a clue in this area as to what caused the crash.
Next thing we need to consider is if your computer is experiencing an over heating issue.
Two programs can help you diagnose this possibility, by monitoring your CPU and GPU temperatures.
Below is the URLS to both programs, which are free to download and use.
Speed Fan http://www.almico.com/sfdownload.php
You should also check your CPU cooling fan and heat sink for the accumulation of dust build up.
Dust can cause your CPU to over heat during extreme usage, because the dust acts like insulation and keeps the heat from escaping into the air where the cooling fan can push it away from the heat sink.
You should also have a good flow of fresh air cycling into and out of the computer case.
The last issue to consider is if your PSU (power supply) is capable of supplying enough Amps (working current) to satisfy the demand of the GPU during its peak usage level.
If the demand falls short, the computer can shut down.
An issue with a video driver can also cause this to happen as well.
Downloading drivers from web sites other than the one owned by your hardware can lead to using corrupted or mis-labeled drivers.
Even drivers from your hardware vendor can be bad or buggy drivers, some drivers do make it past beta testing and into public download web sites with a bug still in the code.
Sometimes the bug isn't corrected until another release number debuts.
You might want to try another release date of your video driver, even using an earlier
release date of the driver if the present one is
crashing your computer.EDIT
I see while I was editing this post Bonzo had posted a useful tip above mine here, I seen it once I had uploaded this post.
Please try what Bonzo suggested.
@ Bonzo, thanks for your suggestion above.