1. Not sure
2. Yes, obviously.
3. Try Steam, maybe they sell it there (Note, I said sell).
4. This is piracy, so I hope they ban your ass if you try it.
5. Well heck son, this one you should be able to find in the game manual when you buy it.
Oh well thanks, i wanted to try the cracked version because i live in mexico and its pretty hard to get GTA 4 for PC original i guess im buying from eBay =/