Ok, thanks for the reply. So, I did the search with the diagnostics program, and it said there was a .ASI loader error, so I found out that I had 2 asi loaders in my GTA IV folder, so I deleted one of them and the problem was gone. But.. I wen't ingame, tried to press ALT + P but still nothing happened.. Here's some log, not sure if it's the right one or you can use it: