Make sure steam is not running!

Proceed to Local Disk (C:) > Program Files (x86) > Steam > userdata > and look for a folder named 730 and delete it. You may have to go into other folders to find it first.

May vary where Steam is located if you didn't install it in Local Disk (C:).

Proceed to Local Disk (C:) > Program Files (x86) > Steam > steamapps > common > Counter-Strike Global Offensive > csgo and delete the folder named cfg...

IF YOU HAVE A AUTOEXEC YOU'D LIKE TO KEEP...MOVE IT TO YOUR DESKTOP!

Once again, May vary where Steam is located if you didn't install it in Local Disk (C:).

Go into steam and right-click csgo and go to properties and then click the local tab and verify integrity of game cache!

Thanks <3