I can't remember when it started, but I know it wasn't before I bought my 2xGIG of ram.

I get the BSOD randomly. It usually says something different each time. When I was using Vista, I did a memory check and it said that there is a problem with the RAM, but I did a check on XP and it said there were no problems. I'm doing an extended test at the moment.

I'm going to PC World later because I bought it off them (their own make-component shop), but I don't think they're very well trained and I don't think they would know what to do and wouldn't replace it.