So, best guess is that your problems are being caused by a faulting 3rd party driver, and these can be difficult to find.
Do you remember installing anything just prior to your BSOD problems starting, if you do, then uninstalling it may resolve the problem.
Presuming that you don't remember, which is usually the case, then we have another possible way to discover which it is. This is not always successful, and does carry some risk, but it's the best I can suggest.
Please read the instructions in the following post .... http://www.sevenforums.com/crash-lockup ... post581811 .... to run verifier.exe, then if/when your computer blue screens again, attach any new dump file that is created.
Warning this could cause your machine not to be able to boot into Safe Mode as well, so back up your personal files and folders before you perform it, and also create a System Restore point that we can restore to. If you don't know how to do that let me know and I'll post instructions.