The reason why I asked you to turn on AA was because those shots looked like it was off and if you read the links that Sprooty provided it would be "normal" to have those "zig zags" if AA was off.
But now that you say it is on...did you turn on AA in game or from Catalyst? Try to turn it on in Catalyst.
I'm assuming that you did not have these "zig zags" last time as you said these are recent problems? I'm also assuming you had AA on in the past?
Try earlier Catalyst drivers like 5.1 or 4.* and see if it still happens. Make sure you do a clean install of the drivers. Use Driver Cleaner Pro if you don't already.