Franky, I don't know who prevx 3.0 is nor do I know who is the She
you're talking about.
Anyway, McAfee is known to cause BSoDs. Please uninstall it.
How to uninstall or reinstall supported McAfee products using the Consumer Products Removal tool (MCPR)
Download and install MSE, and run a full scan once updated. Link to MSE:
Microsoft Security Essentials - Free Antivirus for Windows
That's the reason I jumped to this thread.