Whoever said that I am a troll cause I prefer consoles more for games than PC. And I don't even like the LCPDFR mode to be honest, played it for two days and got bored of the same missions and stupid AI. I also did delete my GTA IV off the PC as it was a failure on it, but it's an awesome game on PS3 and XBOX 360.
;)
Try setting the Compality of the LaunchGTAIV.exe to Windows 2000 and then running the game as an adminstrator..
And also patch your GTA IV to GTA IV - Version: 1, 0, 7, 0