I left it running for ~3 hours.No memory errors? How long did you leave it running?
We've pretty much narrowed it down to being drivers or something goofy with Windows. A reinstall should fix it. If you need a copy, let me know.
I use Internet Explorer for everything besides stuff I don't want to save (porn, movies, tv shows) so I'm guessing it never closes properly. I'll download NoScript but I don't know how to block JS (JavaScript?).If you're using Firefox, you should not have iexplore.exe running at all. Sounds more like an attempt to install a rootkit that ended up screwing up the hooks causing instability. I don't know what's so complicated about a code-cave and a JMP, but some people can't seem to get it right.
Anyways, why aren't you using NoScript and Adblock plus? Block all JS and make exceptions for what you need.