The site that runs letterbomb is currently unavailable for some people. You'll have to wait for it to come up again, or use a disk-based exploit.
You wouldn't have had to delete HBC, you could have reinstalled it on top of itself, if you still had it. But since you did, you'll have to start things over.
I would have had you post a syscheck (directions in my sig), but without HBC, you can't do that until you can get it reinstalled.