Unable To Install New Video Card Driver On Windows 7 64 Bit?

So My new Windows 7 Home Premium 64 bit PC doesnt seem to want to sleep. I'm away to work for a day at a time and when I get home the PC is up and running.I found this article:Windows 7 will not sleep or not sleepingwhich indicates to update driver, particularly the video card driver. I go to the vendor site and download the newest driver. I go to Device Manager open Display Adapters and find my card, double click on that and I'm in the properties. The driver date is 9/2010 so there is definitely a newer driver. Click on update driver/search on computer and navigate to the folder where I downloaded the new driver. I click next and get "Windows has determined that the current driver software for the device is up to date" and thats it, no apparent way around.