I can see the gta4.exe process start, then for a few seconds it closes. No error messages, no crash window or anything.
OS: Windows 7 x64 Professional
Processor: Intel Core i3 Quadcore @ 3.30 GHz
RAM: 4 GB DDR2
Video: NVIDIA GeForce GT520 3.7 GB video ram
Here's what i've done so far:
Reinstalled the game multiple times
Made sure no mods or anything is installed, only the 126.96.36.199 patch
Ran both LaunchGTAIV.exe and GTAIV.exe as administrator
Ran both in compatibility mode for Windows XP SP 3
I can't think of anything else. It has never done this before. it was sitting on my computer and i hadn't played it in a while so i started it up and it crashed. i thought maybe it was some old mods conflicting so i did a fresh install and it still crashes in the same way.