P5edpokladam, ze tohle uz jsi taky zkousel

Right click on csgo.exe (in c:\program files\steam\steamapps\common\Counter-Strike Global offensive), select properties, then select Unblock

There will be this message:
"This file came from a another computer and might have been blocked to help protect this computer." and a unblock button.
Press the unblock button, and then close the properties page. You might have to accept a UAC dialog first.
Reopen the properties dialog and the unblock button should be gone. Now csgo has full computer access.