I don't have a system restore point set. Doing so will erase all the files on my computer.
Computer is definitely not overheating; Speccy's shows me the temperatures and they've always been in reasonable levels. Don't have any compressed air to use currently, but the inside of my computer (transparent side on the case) shows that there's hardly any dust there anyway.
The graphics card is a
GeForce GTX-560 Ti. Computer's custom built and less than a year old. Not sure what the tech would cost but with a one-day-a-week job, I can't afford the costs anyway, not for a few months.