Hello, I am running Win 7 64-bit RC on my machine. Previously, I had run Win XP Pro x64 Edition with great success. I heard Win 7 had many great things to offer so I took the switch, and unwisely dumped my XP install. Now here I am 7 months later, and I'm tired of the graphical glitches in my games and with Aero and want to create a dual boot to play games inside XP. However, the disc I've used to install Win XP x64 previously will not allow me to boot into it now -- if I put it in while Win 7 is running, I get this: Imageshack - winxp Also, for some reason my OS only recognizes 3GB of my 4GB available RAM... is there something wrong? System specs: Windows 7 Ultimate 64-bit RC Intel Core2Quad Q9400 Gigabyte GA-EP45-UD3P Nvidia GeForce 8800 GTX 4GB Corsair RAM Any help in the right direction that could be provided would be greatly appreciated. Thanks!