Driver_IRQL_Not_Less_or_Equal

[cabdriver]

So, I just set up my new computer and put Pro Tools on, installed the driver for the interface, plugged in the firewire, and can go about my business for a while, but eventually, the computer will crash unexpectedly, the BSOD showing driver irql not less or equal and points to avidmboxpro.sys as the culprit. I haven't used Pro Tools yet (as I don't want the computer to crash whilst I'm working on a project). It ran Sibelius smoothly with no problem. I suspect it's a conflict with the on-board sound card/driver, as the computer has only crashes while I'm streaming audio/video from the internet. I have updated every driver (from device manager, I'm not sure if there are drivers I must update manually), I've disabled the HDMI audio driver, and reinstalled the Mbox drivers again. I'm not sure what else I should do; any suggestions?

Windows 7 Home Premium OEM, 64 bit
8Gb ram
3Ghz AMD processor
Pro Tools 8 LE
Mbox Pro 3
Realtek High Definition Audio