Let me google that for you, son.
Sounds like Steam has got its self stuck in compatabilty mode.
This is how I and others have managed to fix it:
1. Hit start->run->regedit
2. Go to key: HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\Layers
3. Look for a entry with your path to steam.exe
4. Delete that entry
5. If you dont find it there try HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\Layers
You should also be able to launch the game via the gta exe located in steamapps > common > GTAIV without the need to mess with the registry, or the need to have Steam running. Steam will still be stuck in compatibility mode, though.
Sist endret av Hutch; 20. oktober 2013 kl. 04:34.