Windows 7: Driver_IRQL_not_less_or_equal Windows 7

Hello everyone!
I've had a problem with a BSOD error that has popped up time and time again these past few months.
My system specs are as followed:
Windows 7 Ultimate x64
EVGA Nvidia Nforce 780i SLI
Intel Q9550 2.8ghz
GTX 470
8GB corsair RAM DDR2
Soundblaster x-fi xtreme audio



I built this computer myself about 4-5 years ago, occasionally updating the video card as time went on. I initially started the computer with a GTX 280, got the 470 about a year ago.
I haven't reinstalled windows since the initial installation, and I most likely won't be able to because of my inability to figure out where I put the damn disc :3

This happens occasionally on start-up and majority of the time while playing video games.

Ordinarily, I do not recommend this right off the bat, but you have not re-installed Windows in nearly three years. I would highly recommend a Clean Reinstall - Factory OEM Windows 7.

Your newest crash reports were a year old, and could not help me determine the problem due to their age. That is another reason I recommended the above.

That is odd, I just did a new memory dump a week ago when it crashed.

Sadly though, I can't reinstall Windows 7 because of the lack of activation key. I'll try and see if I can find the case, maybe I'll get lucky.