Try uninstalling the driver this way:
Shut off the antivirus!
Use the uninstall in the Control Panel to uninstall the driver and say no to reboot.
Delete the driver folder and empty the recycle bin.
Install Ccleaner and run the "registry" section of the program and fix all problems, save when it asks you to. Now you have a backup in case it took something you needed....never has for me and I have been using this program forever.
Restart the machine.
Cancel both popups.
Shut off the antivirus.
Install the new driver, reboot when prompted.
If this series of steps don't fix your issue, one or more of the video cards may be bad.
To check which one it is, you will have to pull one out of the pc, then run a game. If the issue persists, switch cards and try running the game again. If the issue goes away, you know which card is bad. If the issue persists you can try the cards in another machine to see if in fact it is the cards or not. You must shut down the machine and pull the plug from the wall each time you either pull the first card or exchanged it to try the other card.
If you still have problems, try switching out the psu to see if the cards are getting low voltage.