Hi, I have a machine [ core2 duo e6400 , P5B Deluxe , 2 x 1GB DDR2 667Mhz RAM ] on which I plan to run windows xp pro. But I will later replace the two 1GB DDR2 667 modules with two 2GB DDR 800 modules. Will replacing the 667 modules with 800Mhz modules cause any issues. Will I have to reinstall windows again after the replacement. Plz advice. Thanx in advance