Beta Patch Won't Install

[Dylan748 17]

Alright, I have tried restarting Steam multiple times and everything in the book. I have the command line set up right but when I try to run it I get the image in the attachments

I tried installing the Beta Patch before running Arma II: AO, that might have messed it up, if it could let me know. But, after trying and failing to install the patch the first time, I ran the game and it worked then I immediately exited to go install the patch.

Please help!

PS: No the game is not running.