Well, here's my two cents for what it's worth. I had the very same problem with 2 machines and the fix was the same on both machines. I had no option for Sleep mode anywhere on the computer, and I mean no where. I too had the Standard VGA driver, but updating that didn't seem to fix it. Actually I couldn't update anything because of that error code, 80072EFE, which was fixed with a download that I saw here today in another post. I had an unknown device issue too, that I couldn't get taken care of. Once I got the Windows Update issue taken care of, it went looking for updates and found 147, including Security updates. I downloaded them all and ran them. Once I rebooted the machine, the unknown device was taken care of and so was the updated video- no more Standard VGA driver. That also took care of the 'no Sleep mode' problem. It's right there and working fine now. BTW, this was a new installation. That's why so many updates.