A8-7650K has an GCN iGPU - so 20.12.1 should work
1. disable Win10 auto-driver-install & reboot
2. delete C:/AMD
3. run DDU in safe-mode to clean old driver
4. install 20.12.1
ps - do you also have a dGPU and maybe disabled your iGPU in BIOS?
PC: R7 2700X @PBO + RX 580 4G (1500MHz/2000MHz CL16) + 32G DDR4-3200CL14 + 144hz 1ms FS P + 75hz 1ms FS
Laptop: R5 2500U @30W + RX 560X (1400MHz/1500MHz) + 16G DDR4-2400CL16 + 120Hz 3ms FS