Random unknown process driving me nuts.

[Kysmet]

OK, so.. I have a slight problem, and I'm not entirely sure where to start fixing it XD

I have a macbook pro, which I got bootcamp running on, and am now using Windows XP on a partition of the HD so I can play FF on it every now and then.
I noticed last night when I was getting ready for Salvage that all the sudden, EVERYTHING seemed like it was lagging really bad. So I reboot, and I can't get Firefox to open, or POL. I check the system processes that, despite the fact that I don't have a window open, Firefox has a process running at 25+%, and there's a random process simply named "System" thats running at 50+ %. I've run Norton, and it didn't find anything. I can't download AVG or anything because freaking firefox won't open and IE freezes up every time I try to navigate away from the home page?

What went wrong? And is reinstalling windows and everything on that partition the only way I'm going to solve the issue?

[Norellicus]

Download HijackThis, install it, and select the first option; then copy/paste the entire contents of the resulting text file back to here.

Edit: First, try simply booting the thing into safemode and see if it still bogs down and/or has the high CPU usage on the random System process.