Got gta IV and installed it, first time put disc in it booted fine but took a while. After installation securom gave me a few errors before the game started working fine. I managed to boot up the game 3 consecutive times without any problems. I then installed 1.6 patch which caused problems and the game would no longer boot, so I uninstalled it and removed all rockstar files and folders. Now when I insert the disc it won't even boot so I can get to the installer, the drive just keep reading it and does nothing and it isn't shown as having any disc in. Other discs work fine. What to do?