New pc running ridiculously slow

Antonius2389

Reputable
Jan 23, 2016
5
0
4,510
I just built a new pc with a CROSSHAIR V FORMULA-Z motherboard, got everything installed and booted it up. I used a harddrive from my old computer with windows 10 on it and when I tried to download drivers, it said it wasn't compatible with my operating system. I reverted back to windows 8.1, but everything ran extremely slow. I managed to download the new drivers for everything onto an external drive and got them installed on the new pc, but its still running really slow. I haven't the slightest clue as to what to do now.