What does Device Manager show?
You can locate Device Manager under Windows Control Panel.
What exact errors are showing? If the Driver is not working, in Device Manager you should see MS BASIC DISPLAY ADAPTER instead of SVGA.
Try using DDU (Display Driver Uninstaller) in Safe Mode with the Internet disconnected. Once DDU finishes and reboots back into Windows Desktop, STILL with the Internet disconnected, try installing the last ASRock driver for your APU and see if it starts working correctly.
Afterwards, Check Device Manager again and see if there are any errors or Yellow exclamation marks showing.
Also run SFC /scannow in a elevated Command Prompt to check your Windows installation for corruption.