When I initially built my system I put in 1GB kit ddr2-533. Yes I got yelled at for doing this. Anyway, I replaced the 1GB kit with 4GB kit ddr2-675 (4x1GB). After I installed the 2GB kit and my system posted 4GB. On my computer, view system information, it says 3.25GB of ram. I'm just making sure, is this because Windows XP can't handle more than 2GB of ram? But my system is fine? Thanx