Some other little bits of advice from a paranoid gamer. Upload your save somewhere (and your collage work, and anything else you need to be able to retrieve). That way if your problem is more than just ram, and you end up loosing data on your hard drive, you can just download it again. Another thing is if you think it might have been the summer heat that caused the problem, make sure that you use your computer in a ventilated room, and if possible get a regular fan to keep air moving toward you and your computer. And speaking of ventilation, even though you don't know much about computers it should be fairly safe for you to open yours up and see if there is much dust build up. If so get a can of air and blow out the inside, as that will help it from overheating.
These little things should help you be able to use your computer a bit longer before it decides to crash on you, though if it's crashing that suggests that some damage has already been done to the hardware. I wouldn't suggest doing things like DF on it until you are sure that you have found out what was causing the crashing and had it repaired or replaced. IE: It might be that the ram is damaged, but that might be because your computer's fan isn't working, and you need to replace both the fan and the ram. While I type this, and think of fans not working, you might want to consider checking your CPU fan also, as it might not be a ram problem but a CPU that's been overheated.
Of course this all assumes that the problem was caused by overheating. But even then these are good things to check on your computer every now and then anyways.