From what I read on the NVidia web site, the level 340.52 GeForce driver has a lot off issues, not just with GC3, but with a lot of other games as well.
If anyone needs info on how to back off the NVIDIA GeForce GT series driver from the troublesome 340.52 level, here is what worked for me:
To roll back your driver (I recommend the 337.88 level) go to www.nvidia.com -> "Drivers" tab ->"Beta and older drivers", fill in the six fields (all of them are pull down lists) "Product type", "Product Series", "Product", "Operating System", "Language", and "Recommended/Beta" and click "search". Then select a driver to start the download.
Don't forget, if you are using "NVIDIA GeForce Experience" to change your settings to prevent automatic updates. Leave notifications on so you can get a notification of a newer driver when they fix this problem (which might initially be a Beta).