Conor4011

2 days ago i decided to buy Combined Operatiosn on Steam seeing that DayZ has been released on it and I thought it was time to play. This is my problem: I downloaded Arma 2 and Operation Arrowhead to my computer smoothly, but when I tried to launch Arma 2 it gave me the Bad serial number given in setup error. This was before I even downloaded DayZ from the store and I have never played Dayz or any Arma 2 before this (obviously). I do not understand how this happened. Most people say it happens after you mod or hack in the game but I couldn't have if I don't play it. I am now thinking some virus or whatever stole my CD Key because in regedit there is no key displayed at all and then when you click on it to edit it looks like this : 0000. But how could someone or something steal my key before i had played the game at all. I download stuff here and there but most of it is verified by my anti virus software (Kaspersky 2010). Could I somehow contact steam and get a refund for the game not working of the install?? Please help me