If you google the bluescreen message, it should give you a pretty good idea what you're looking at.
Download the bluescreen viewer from here http://www.nirsoft.net/utils/blue_screen_view.html (Zip at the bottom of the page) and run the program on the affected computer. it will allow you to view the bluescreen info.
It's pretty easy to decode. you should see:
1) the offending file. (2nd line, or below the stop code)
2) the message about it (3rd line)
3) the stop code (near the bottom)
Once we have that, we can probably have a good go at pinpointing it.