So, actually the installation goes normally and when you install the graphic card drivers and restart the PC, the issue appears, right?
I would start by restoring BIOS to its default settings. If there were any overclocking or voltage changes, they should be fixed. When you are in BIOS search for MB Intelligent Tweaker and make sure you reset it to its default settings.
If this does not solve it, run the PC without the graphic card connected. Use only the integrated video and check if the issue persists. Replacing the HDD with a SSD will boost the performance but unfortunately may not help you resolve the issue. Anyway, when the problem is resolved, you will have a good addition to the PC.
Hope this helps