Cavendish, mine came in the post Thursday also. I've installed it 3 times over now (once in safe-mode) but still I double click the armaII desktop shortcut, my hard disk light shows some activity, task-manager sees a process called arma2 running for maybe 5 seconds, my dvd drive light shows activity for perhaps 2 seconds then arma2 gets dropped from the process list. After that, nothing... as if I hadn't even tried it.
Updated my dvd drivers, video drivers but no joy. My specs are over the minimums and i'm the proud owner of a legit boxed copy of armaII however 6 hours and 3 installs later I still cant get past the desktop shortcut. Securom is just a joy isn't it.