Haha no problems with console games you're hilarious. Are you really saying consoles don't have issues? Please tell me you aren't that big of a fanboy.
Sorry lost my train of thought.
Have you tried checking the temperature on your GPU/CPU? You can do this by downloading nvidia monitor view/ ntune. (Nvidia has some issue with inconsistency, sorry.) Thia can be found on this site
NVIDIA nTune
If you're card or CPU is running hot then it may be closing down anything causes extra stress to prevent damge to components.
Also instead of downgrading drivers, have you updated them all? Of course a dxdiag could help find these problems but I don't think that'll be needed.
Is this blue screen blank or is this the "blue screen of death" when windows informs you that it is going to be dumping your memory?
Also are you overclocking any of your components? This can cause instability even when done carefully and is something to be looked into.
Get back to me if you find a solution/need more advice.
Oh yeah and if you do find that your GPU/CPU are running hot (GPU's should run no hotter than 80c, anything much higher is likely to cause damage, and CPU temperatures can vary depending on model and make.) you can try to open your case and clean out any dust that could be clogging heat sinks and reducing airflow from fans to heatsinks.