Attempting to clean install Win 7 64 bit on WD 750 GB SATA disk. Quad core processor; Intel D975XBX2 MB; ATI 8550 graphics card; Creative X-Fi sound card; Acer P241W monitor; 2 Plextor PX800A DVD drives; USB keyboard & mouse. Goes through the install and reboots. Shows "Starting services" then message "WINDOWS COULD NOT COMPLETE THE INSTALLATION. TO INSTALL WINDOWS ON THIS, RESTART THE INSTALLATION. Restart does not return to start of installation. Any ideas?