My problem occurs as soon as i start to install H&D2 an error message pops up and says something about InstallShield Scripting Runtime Error?? I've tried solutions over the internet but nothing works im thinking about restoring the comp back to factory settings to solve the problem as im getting really frustrated with it now.

I tried installing another game (Civ 4) and this installed without any problems and needs superior system requirements than H&D2 to my knowledge.
The graphics card is a ATI Radeon x800, If you need anymore info i can get it thanks.