If you're sure you already installed "ATKACPI driver and hotkey-related utilities" from the ASUS page the only other thing I would think to try would be in the "Others" section --> 'Keyboard Device Filter Utility'
If this doesn't work either, you must have changed a setting somewhere. Try to find a dialog that will let you change the settings. Check Start > Programs > Asus ... also, in the control panel control panel, switch its view to small or large icons. Check for anything related to hot keys. Also, check Ease of Access Center > Make the keyboard easier to use > Check 'Turn on Toggle Keys'. See if there is anything else in that window that might give a clue.Asus drivers
for your model
Edited by kisk, 25 April 2012 - 12:24 PM.