If you choose another sweep don't reboot after it runs. Go to Control Panel\All Control Panel Items\Programs and Features and check for any Nvidia items and uninstall them.
It seems most GFX drivers, AMD and nVIDIA are buggy these days, from flashing displays and odd colors to "This driver has stopped working" errors. I have the 285.62 running, surprisingly, just fine. Hopalong has the same card as me and it's wonky for him.
The only reason, as I see it, to update a driver is to add functionality to do something not possible before. Since I don't play Grand-Theft-War-Craft-Battlefield IV, I am happy with older drivers too sometimes.
For a long time I used the 270.61 driver from April.
[/rant]