I have an Intel D975Xb2 running Win7 64 SP1. I with a E6700 Core 2 CPU. It currently has 4 megs ram. I have been trying to install 4 2x2 DDR2 800 Mushkin memory modules but the system says it can not find the boot drive and the system want to correct Win7 . When I put back the original 4 ones it works. What I have a second system with the same mainboard, and CPU WIN7 and I do have 8 mgb ram installed . What am I doing wrong with the first machine.