jwawka :
I'm using a 600W supply Bronze certified. I think I'm going to take it in next Friday or Saturday to a shop.
Do as follow to completely remove your amd gpu drivers:
First of all download Driver sweeper from here: http://www.guru3d.com/files_details/driver_sweeper_down... and extract 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 remove all your amd graphics drivers.
4. Restart and boot to the regular desktop
5. Install the latest nvidia driver.
Restart