The maps can be recovered because they are saved locally in C/Feralheart, so they can be backed up and moved back.
Make sure the program has all administrative rights and is not being blocked by a virus protection client.
If you think it should be running, you can go ahead and try to download a new copy of the game, just back your files up before you re-install it. It shouldn't lose anything if you do re-install it properly, but do it just in case.
