I to have had the same problems and left two tickets but no one ever comes to answer them, that a shocking service they don't give, I have written to uk mags to advise others to to make the same mistake and purchase off them.
Cheers,
Running win 7 32bit, nvidia 6800 latest driver , 16gb ram, seems to be a graphics issue as I have have ran on the lowest quality and it then runs but try upping anything and it crashes at the point the sim should start
Bought 3 moduals but dcs crashes, I have left 2 tickets but have not had a single reply in over 3 weeks, what a crap service they offer, no phone number and a con, has any one else had such a shocking service