If you are on 320.something its known for issues.
Update or roll one back.
I have to look at the version number I rolled back to. It was from February 2013. That was the oldest I had still on my computer. I know the last good driver I had used came out in May 2013 but I don't know the version number offhand. I'm assuming the old drivers are archived on NVIDIA's website. I'll try that. Thanks.
I also read somewhere about some Microsoft Framework conflict. I know I have installed OS updates. Maybe that has caused issues? I have to look and see how far I can go back with system resotre on my computer.
I am not at home so I haven't tried rolling back further but I can confirm the version drivers that I tried are 320.18 which was working for a while, 320.49 and 327.23.
For reference I have Premiere Pro CS5.5.2 and the latest Windows 7 64-bit updates installed.
The mobo is an ASUS P6T Deluxe.
When I reinstall the NVIDIA drivers I use the clean install option which completely removes the previous version before reinstalling. I found that I have to reinstall this is the best way since uninstalling from the control panel only adds the drivers back on a reboot.
Try the 314 driver. I've had no issues with it.