Ok so my computer's better now, but it's still not perfect, as i've found out. For the normal running of windows it works fine, but it slows down once it starts actually doing anything. The MemTest says to leave it for 20 minutes, and i figured that meant it would be at 100% by that point, but after 7 hours it only got to 67%, it had no errors at that point, but i had to stop it so i could actually use the computer. My DVD drive isn't even fast wnough to play a CD well enough a DVD. When i was running microsoft office i was running other things as well, so that's not really a fair test, but that was slow as well, and that's all the programs i have on it right now.
I'm running MemTest again and letting it get to 100% this time to see if it picks up any errors, but any other ideas for the mean time?