There's a few you can do to get Grand Theft Auto IV running properly. The first you can do is not pirate the damn game and actually buy it from the store, making sure not to use a crack. I wouldn't be surprised if this fixed a huge number of problems. The second you can do is make sure all your drivers and your operating system software are up to date and correctly installed. The third is you can wait a bit for a patch. Maybe, you know, play another game for a week or two. You may have noticed that games can be installed - they do not "run out" if left inactive.