Normally I would go about this problem as follows.
1. Uninstall your current display drivers through their official uninstaller or by going to Device Manager and selecting uninstall.
2. Reboot into safe mode. Do this by tapping F8 as the computer starts up, just after the BIOS screen has gone.
3. Run Driver Sweeper
and remove all entries related to the display drivers.
4. Reboot back into normal mode and install the latest display drivers available from the AMD/Nvidia website.
Let me know how you get on with this.