If the copy protection exits without an error, it means the problem is with the game itself starting (the progress bar only ever goes to 1/4 or 1/3 before it is done).
I'm not sure what else to suggest, that wasn't already mentioned in the other topic you posted in,
yet another "Game simply won't start!"-thread.
There is no virus on the CD. It is much more likely the anti-virus and spyware programs are choking on the copy protection (AVG had no problems when I just checked the UK English version).