"Bad serial key used in set up" Error

[joss533 0]

Hello i really need help because after being killed by a hacker i restarted dayz and it said "Bad serial key used in set up" Iv tried what the other guy said on this same type of post but i didnt work please help

Edited August 3, 2012 by joss533

[joss533 0]

Please help it wont even let me open arma 2 or arma 2 oa!