I'm assuming you've tried a system restore to a point before this started? Have you tried a sfc/scannow to check for and possibly repair any corrupt system files? Heres a link to a tutorial on how to do that if you haven't before
http://www.sevenforums.com/tutorials/1538-sfc-scannow-command-system-file-checker.htmlYou could also try a startup repair
http://www.sevenforums.com/tutorials/681-startup-repair.htmlHave you checked all your drivers? HIt the Start button > type device manager > choose Device manager. Do you see any yellow triangles? If so right click on them and choose update.
If you have recently reinstalled Windows, have you reinstalled the ATK package from Asus?
http://www.asus.com/ROG_ROG/G74SX/HelpDesk_Download/Thats also the place to get drivers for most of your machine.
G74Sx BBK-8 Crucial M4 128GB.SSD/W.D.500Gb.@7200 HHD 16GB. RAM Stock otherwise.
An End,even with Terror is better than Terror without End. F.Nietzsche