UPDATE:
So, I took it halfway apart yesterday, and everything went pretty well. I had to leave it in class halfway taken apart

when I got home last night after my dad went to bed, I took his all the way apart, you know how when you get a fan blade and you turn it just for fun, well when I did that, it was stuck in place, hence the reason it kept overheating. I then put it back together, and booted it up, and guess what I heard (the fan actually running

) So, just a few minutes ago, I popped back in the class to finish taking it apart, and my fan was lodged stuck with a clump of dust. I spun it all the way around, and the clump come out. So, I started to put it back together, but had to leave. I will finish in about an hour, and update you all! I really hope this fixes it. I also replaced the CMOS battery with my dads laptop one that was for sure working, and it still gave me that error screen, I didn't re-flash the BIOS or anything, I just booted past the screen, I will update all that once I turn it on. Also when I turned my dads on last night, and booted into Vista

it wasn't getting NEARLY as hot as it was before!