Defective video card. You can use Driver Sweeper to clear the ATI drivers/settings, in safe mode. Then boot to normal and install the driver: Drivers & Support | GAME.AMD.COM But it's unlikely to help. If not, replace the card. Also update bios to latest before doing so. ------- Update Realtek lan driver: Rt64win7 Rt64win7.sys Wed Jun 23 05:10:45 2010 RTL8111 -------- Navigate to C:\Windows\System32\drivers Rename this driver to RtNdPt60.BAK - RtNdPt60 RtNdPt60.sys Mon Dec 10 21:49:52 2007 Reboot.