SassyRat

Hello, so I recently purchased Arma2: CO and wanted to play DayZ, however after trying to run OA for the first time, I would get an error message telling me Bad Serial Number Given in setup. I am not to good with computers, I've posted in a few places, people say just run as an admin, I do, but still the same error, so can anyone help me out on this one?

I have a digital, bought on Steam.

Thanks had the same problem and ran across this thread!