Then I would repair the operating system with a format. If windows still won't finish the installation process, then set the bios to the default settings and install with one stick of ram only. When it finishes installing, check the other ram sticks with memtest in case one of them failed. Do this one stick at a time in the slot closest to the cpu. In fact, if you want to try it, use just one stick of ram at a time and see if windows will load. May save you alot of time doing a fresh install.