That's indeed one thing I haven't thought about. I have a firetruck on my parking space from ages ago (save game). I'll try your suggestion and see how it turns out.
Weird I have always been on an administrator account but 'Run as Administrator' is not ticked on LaunchGTAIV.exe and GTAIV.exe... will launch them on these settings and see how it turns out too.
Steam version, automatically patches for me. :)
UPDATE: It's sort of fixed for now, thanks guys! :)
