Missing data files?

[KittenMittens 0]

I had the 'CABuildingparts' missing problem described HERE

I then moved my addons folder from Arma 2 into the Arma: OA Folder.

This solved the problem of compatibility but I think it screwed with the UI.

When I right click on an item in my inventory the selection box goes to behind the inventory, so I can only use items located in the far right side of the inventory (and only if the box is below the debug monitor). It looks like this:

The main menu doesn't look like Arrowhead anymore, it looks like this:

I'm guessing that when I moved the files over I somehow overwrote some of the Operation Arrowhead files, but I didn't have any notifications saying so when I moved them.

Does anybody have any ideas which files have been corrupted and how I could rectify it?

Thanks in advance