To play on this server remove listed files

[lonelyhooker 0]

This is the error I get:

Files "addons\a10.pbo", "addons\air.pbo", "addons\air2.pbo", "addons\air3.pbo", "addons\animals.pbo", "addons\animals2.pbo" ... are not signed by a key accepted on this server. To play on this server, remove listed files or install additional accepted keys.

I have the retail version of Arma II and I've re-installed the game 3 times. Can someone please help me.

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Anyone?

[durbinh 0]

Do you have combined operations because that is what is needed to play DayZ.

[Mountain Dew 13]

im having the same problem i had combined operation once but my arma2 oa folder was mix with my arma 2 folder and created a combined operation file on my desktop but then i uninstalled everything and changed the way the arma2 oa folders was inside the arma2 folder should i start over and add the arma2 oa folder with arma 2 to have combined operations

[leopard1a 1]

I have the same problem with the BAF DLC i bought today. Can someone please help me ?