I wanted to play LAN with my friend. I have 2 computers next to each other. The first thing I tried was to copy the game to the other PC with a pendrive, and got this error.
I thought "okay, I'll install the steam version then", but then I installed the Steam version and got the exact same error. None of the common solutions work like deleting the SecuROM folder (it doesn't even get created), running SteamActivation.exe (same error, even as admin), running LaunchGTAIV.exe as admin (same error), giving full access to Appdata\Local\Temp (I already have full access)
Can anyone help me? I have Windows 7 64-bit, and the game worked just fine a few months ago but I reinstalled Windows since then.