i too have recently had bad cd-key messages, i thought it may be something to do with the most recent dayz update, so went onto forums and was told the same as you, re-install and run as administrator ? first up i have no idea how to do this, and secondly why should i have to, i bought a digital download of arma 2 combined ops about 6 months ago and it has worked just fine, till the last dayz update, now i cannot log into any server, i just get a bad cd-key, cd key disabled message ?
who do i complain to now, is it steam or dayz commander, tbh the whole process of buying/installing arma and dayz commander has been a nightmare to navigate and no-one seems to give me a straight answer.
i have not downloaded any hacks, does not interest me, as suggested in the dayz forums - am i missing something here or is bohemia just another rip off company who is quite happy to take your money but when it comes to customer support there is no-one culpable ?