" Please remove these files or download additional acceptance keys " problem?

[twd28888 2]

would only like to hear solutions from people who have HAD this problem and fixed it, no disrespet, im sick of people telling me to " google it "...coz googling it brings me back to this forum. so none of that please.

[The_Albatros 72]

Bought off Steam?

Try verifying your game files.

[twd28888 2]

operation arrowhead was from steam, arma2 from disc, i think i did that the last time and nothing happend