Bad Serial number given in setup

Hi i bought a new CD key today ( from a seller on here) and he's not online to help me so thats why im making this thread.

I'm getting "Bad Serial number given in setup", i goggled around and saw only 1 fix for this thing more or less and that in the regedit files, i looked and the permissions is all set up and all that and still this happens, i even manually entered the cd key in hex format and still it dosnt work.


Ideas?

When you steal a person's key there's the chance that it can get banned. I think battleye bans for having the keystealer virus running.