Plug your monitor to motherboard> remove gpu> reboot and download Driver sweeper from here:
http://www.guru3d.com/content_page/guru3d_driver_sweeper.html and extract it.
And download CCleaner from here: http://www.filehippo.com/download_ccleaner/ and install it.
Then follow the steps below:
1. Uninstall your graphics driver through the control panel->Program and Features.
2. (Important)Restart and boot into safe mode.
3. Run Driver Sweeper and unistall all gpu drivers in your pc.
4. Restart and boot to the regular desktop.
5. Run CC Cleaner and remove registries.
6. Plug your gpu and plugin pcie connector in your gpu
7. Reboot your pc
8. Install the new drivers.