Wow.
I have Windows 7 64 bit and I'd like to think I know my way around in it. But, to be honest, I don't do much in the video department, other than simple things like ConvertXtoDVD. I'd love to learn Sony Vegas someday and can get it, but that's for another discussion.
I wouldn't know how to reset things, other than a simple reboot and select "Run Windows Normally", but I imagine you have already tried this?
If I think of anything, I'll let you know, and good luck!