I have also updated Grand Theft Auto with Grand Theft Auto: Vice City Ultimate Vice City mod 2.0 after uninstalling previous version. This mode has added about 40 new cars, new billboards and a bridge and more. New version of Grand Theft Auto has changed billboards, new main menu, adds new bridge, adds a Nokia Store, Add Twin Towers of World Trade Center etc. I think must enjoy the newest version of this gaming software. Uninstalling Grand Theft Auto with Grand Theft Auto: Vice City is quite easy then other software. Add/Remove application entry for Grand Theft Auto:

C:\\WINDOWS\\IsUninst.exe -f"C:\\Program Files\\Rockstar Games\\Grand Theft Auto\\Uninst.isu"

If still your Add/Remove program is not showing Grand Theft Auto application that means game software registry entries is either corrupted or lost due to any reason so that your computer is not recognizing Grand Theft Auto software. You should try profession third party software that works to forcibly uninstall gaming and anti-virus software. Perfect Uninstaller is one of the best tools to uninstall Grand Theft Auto completely from system. It also performs registry cleaning process which deletes unusual programs\' registry entries. Try perfect uninstaller software to uninstall Grand Theft Auto.