This question has been posted a lot lately, I would recommend you read some of the other posts first before posting your own to cut down on the duplicate posts in the board.
Anyway, see
https://bitcointalk.org/index.php?topic=497545.0. You need to sign a message with a bitcoin address you've used in a post from that account to prove you own it. And that post needs to be unedited. If you didn't, I don't think there's any way for you to get your account back.
In the future, post your address in
this thread just to be prepared.
What's with all the people getting their accounts hacked lately? Protect your passwords y'all! Don't download suspicious shit!
