I have a legitimate copy of Gta Iv + a valid patch without ANY mods. I uninstalled all the mods I had and the problem still occurs when I'm issuing a pullover or responding to "suspects fleeing". When it comes to pullover, it doesn't happen every time but when it comes to "suspects fleeing" every time I get some error. It's either Main.Start or Pull.Over or something third. I tried using your Diagnostic but weird problem was there. Few mins ago I says I have everything all right and few mins later it says I don't have an ASI loader and dsound and everything is in right directory.
Anyone knows how to fix this?