Originally Posted by immutableracer
where is that found?? Windows Firewall? or elsewhere?
In Classic (Proper) View:
Control Panel > System > Advanced System Settings > Advanced Tab > Settings button under Performance Heading > Data Execution Prevention Tab.
Then switch Turn on DEP for all programs and services except those I select.
Then you click on add and select the gta3.exe and gtavc.exe. And click on Apply at the bottom then OK.