What do you mean you can't access it? Are you getting a "access denied" error or something else? If it's corrupt, it's would be due to the undelete not being able to recover the file properly, there is no way to restore a file once the file system is corrupt for it, without a backup.
If you just get get to it due to permissions, you can take ownership of the file as an admin account and grant rights to any other account after that.