hey, i can help you here, if you still havent ur CURRENT windows cd, you must restart your computer with the cd inside ur drive, and make sure when ur computer starts up that u press the corisponding F button (F1-F12) im not sure which one it should tell you, that says "Boot from CD" and if you follow everything it says, and do it right you can freshly install windows again, and it erases everything, but if u do it wrong, it will only reinstall windows and you'll remain with all current files.