Have done a successful clean installation of Windows 7 Ultimate 64-bit on my ASUS notebook computer. It works perfectly.
Windows 7 contains the necessary drivers in itself. You don’t need to install the drivers. When the installation of Windows 7 is completed, use Windows Update to get the latest drivers.
Also, install the following Windows 7 drivers and utilities. Everything will work properly.
ATK0100 ACPI Driver
ATK_MEDIA Utility
ATK_Hotkey Utility
ASUS ATKOSD2 Utility
ATK Generic Function Utility
ASUS Wireless Switch (Wireless Console3) Utility
Life Frame Utility
Power4 Gear Hybrid Utility
ASUS Splendid Video Enhancement Technology
Keyboard Device Filter Utility
http://support.asus.com/download/download.aspx?SLanguage=en-us&model=K50IN
Good luck!!