What's the best way to clean install Win7? My PC has WinXP 32 bit Home Edition and although my mobo can take up to 8 Gigs RAM my OS limits what I can use to only 3 Gigs. I need more RAM for my FSX games. My rig is decent enough 3.0 G AMD Phenom II X 4 and I have an HD 6770 video card. I figured that upgrading my OS to Win7 Home Premium 64 bit I could add more RAM. But to do this I will have to save apps and devices since installing Win7 will automatically format the old HD. I appreciate any help.