Does your father know how to disassemble laptops? They can be easily screwed up by improper assembly. I've seen laptops poorly re-assembled by Staples for a repair. If it's being disassembled, the fan will have to come off the heatsink in order to get all the crud out, once that's done, it should perform well. The heatsink doesn't have to come off the CPU but if it does, be sure to buy a new thermal pad for the chipset and put on some quality TIM compound on the CPU, don't re-use any of it.
Being that it's a few years old and the fan has probably overheated from trying to push the extremely hot air, it might also be a good idea to replace it while you're in there. They're usually $10 on eBay for a new one. Definitely do this if the fan is rattling or making much noise now.
If I had money to spare, I'd bet this would solve your issue.
Ahhh okay! Thanks man, definitely appreciate the help. Also, yeah he does. He's being working on computers for years lol. He's usually the one I head to with a problem, but I figured maybe it was something outside that could be fixed instead of inside. But I will definitely keep you updated on after the clean-up if it's improved.

Until then, its off with restarting the game every so often.

Btw, staples?! Who does that?! Lol.
Also, what's the best specs to get if I wanted to run nearly every game? (Just wondering)
-Darth