I had after a long time Bock but because I was now upgraded to Windows 7 once again to this submarine simulation I had problems to get my original version (thanks StarForce) up and running. In various forums I read that this copy at the current offerings (green pyramid etc.) no longer needs to be installed (operating without DVD possible). At Amazon, I soon found, and I thought for just under 5 can not go wrong. So (delivery as always zz) ordered, installed and happy. The game runs without problems and after a short (which was again diving for the key's ...) I make again the Allied convoys uncertain. I've rarely seen a game that so drives the adrenaline in the air. Thanks still numerous existing forums can drive the games fun by mods into the air, even on the subject of screen resolution (I have no problems in spite of 24 "HD monitor, of course, Amazon ...) you will find it. I highly recommend this game for the price only every submarine fan.