Hi, I'll help you. You need to disable BattlEye. How do you do it, you might ask? Well, it's easy. If you have Steam, go to Steam, then to your GTA V library, right-click, and select Properties > Launch Options. Enter "-nobattleye". Then go to Rockstar Games, go to Settings, and you'll see the BattlEye option highlighted in yellow. Okay, disable it. Then go to your antivirus protection, turn it off, and you should be able to play!