If you recently bought the PC version of Grand Theft Auto IV and are experiencing any minor to major difficulties, you're not alone. This is a PC release of a GTA game with the single most problems ever. The bugs have been well documented on the Steam forums, with one user compiling a list of potential fixes. 

The game-loading RMN40 error can apparently be fixed in Windows XP by updating to Service Pack 3. If you are running Windows Vista, then download and install the Microsoft .NET 3.5 Framework and a reboot. A separate MMA10 error requires users to log out of the Rockstar Social Club multiplayer utility in order to play. While the missing texture problems have been attributed to corrupt graphics drivers, many users have been unable to fix the issue after a driver reinstall. The game is also restricting some users from changing their graphical settings.

Rockstar has sent out a general e-mail to fan sites to spread the word that the company is working on sorting out all the PC issues, be it audio, graphical, performance or network related. They advise anyone that is encountering difficulties to contact their local technical support helpline for advice and recommendations. These telephone numbers can be found in the game's manual. You can also refer to Rockstar's support site, which provides regularly updated technical information and solutions to common problems, including a complete list of error codes, and some advice on how to use the graphics settings.