Data File To Short Addons\Characters2.pbo'.Expected 853474296 B, got 695992320 B

[dhall10 1]

I recently bought Arma 2 on steam and when I went to run it for the first time this appeared:

Data File To Short Addons\Characters2.pbo'.Expected 853474296 B, got 695992320 B

Please help ASAP.

Thanks, dhall10

[Placebo 29]

Disable your antivirus, run steam as administrator, verify cache integrity of the game, restart steam.

[dhall10 1]

Disable your antivirus, run steam as administrator, verify cache integrity of the game, restart steam.

How do you verify cache integrity of the game and what does this mean? Sorry and thanks for the instant reply :)

Thanks, dhall10

[Placebo 29]

In the Steam library right click the game, then click properties then click local files and it's in there:

That compares what you have downloaded/installed against what's on the server.

[dhall10 1]

Thanks, but now I have another problem. When I run the game it closes during startup saying 'Bad serial number given in setup'. My brother said this is to do with Battleye but when I went into the games folder on my laptop there is no Battleye folder so I can't reinstall it. I tried doing this by clicking play game then going to reinstall battleye anti-cheat but it says 'This game is currently unavailable. Please try again another time.' so I am unsure of what to do.

Thanks, dhall10

[Placebo 29]

Run Steam as admin, there's a pinned thread with that in the title: http://forums.bistudio.com/showthread.php?135736-Bad-serial-number-given-in-setup-use-this-thread-for-help

Don't listen to your brother ;)