Help me guys, I don't know why i get this error after I downgrade from windows 10 to windows 8.1. After receiving this error, my gaming experience has been impacted because of fps drops.
I open dxdiag and find this line:
The file aticfx64,aticfx64,aticfx64,aticfx32,aticfx32,aticfx32,atiumd64,atidxx64,atidxx64,atiumdag,atidxx32,atidxx32,atiumdva,atiumd6a,atitmm64 is not digitally signed, which means that it has not been tested by Microsoft's Windows Hardware Quality Labs (WHQL). You may be able to get a WHQL logo'd driver from the hardware manufacturer.
Help me to fix this guys.