I purchased GTA IV today after seeing it was on offer. I played online and the download was at around 50% the last time I checked. After finishing playing online I went to check the status of the download only to see it was no longer downloading. I checked my games but it wasn't there so I went to download history and attempted to download the game again. However, a error message pops up and says GTA IV Cannot be Downloaded. I have played the game previously using a retail disc so there is already save data. Is there anyway to fix this without restarting the download?