What he was talking about was, when you notice the game slowing down, is the hard drive light active? This would indicate that data is being written to or read from the hard drive which could slow your system down. You're kind of in the same boat I am, I have an opty 146 which is a single core processor, so I have to shut down most background applications to play games. Since I run Windows XP, I use msconfig to shut down apps I don't want running while I game. I don't know if Vista still uses this application or not.