Sorry to read this, all I can tell is that it worked for me.
Maybe you want to try it once again, as there's always the possibility of entering the wrong password.

Anyway, this message isn't something unusual, a lot of users are getting that error.
The problem is known and Mark Karpeles is working on it. (http://forum.bitcoin.org/index.php?topic=20653.msg258264#msg258264)
Just try again in a few hours.

And don't worry, trades won't resume until most of the users have claimed their accounts, which probably will take some days. I'm not even sure if Mt. Gox is going to be fully operating before the end of this week.