Here is something i do to make my old games work on newer faster computers.
1) Run the game
2) hit the windows key so that your desktop comes up (your game will minimise)
3) right click the task bar and click on Task manager
4) under processes find your games process
5) right click and select 'Set Affinity'
6) you should see a number of processors in the new window
7) untick everything apart from CPU 0
8) close the window
9) from the taskbar click on your game.
This should now slow down your game enough for you to be able to play it