Dear Dean,
Sorry for the delay in responding to your thread. Obviously, we don't want you to be having constant crashing. It certainly sounds like there is some kind of conflict going on, although I'm not sure what it might be.
As a start for troubleshooting purposes, I would suggest attempting to turn off your firewall and antivirus and try running the game, and see if the stability improves.
Also, you may want to consider reviewing
this thread and see if any of that information helps.
Let us know, thanks!
Steve