Hickory: If you have taken all of the suggested steps, then without doubt something on your system is causing this. Since nobody but you knows your system, diagnosis on-line is all but impossible. You need to troubleshoot your own system to determine what is preventing the game from starting.
yes i just decided to reset my system to see if that would change anything and now the game seems to work. However, now i get a different problem, from time to time when im playing the game the screen just goes black (game is still working) and it goes back to normal when i press esc. any idea what might be causing this?