Recently there was a power surge/spike and the computer was in standby mode. Well, it messed up the HDD, so I replaced it. Now the pc keeps crashing quite often with BSOD and numerous stop errors. I did a memtest and it immediately came up with a red screen full of errors. Using the computer right now and it will go hours maybe even days without crashing. Before I rush out and buy some memory, what other things should I check for or is the memtest concrete enough to buy memory? Pc has two 512mb sticks and I didn't test them individually.