Well possibly the config.inc.php file is corrupted.
It does hold the member number of the super admin.
And it is not uncommon that that file gets hosed.
Look for it in the includes folder.
Ftp to your site and view the file.
Usually when and if it gets hosed it is 0 bytes.
At the wiki we have a generic config file to copy and use but it would still need editing to provide your paths,passwords and member id.
http://www.ubbwiki.com/archive/view/1/ubb-threads-v7-config-file.html

As long as you edit the first few several lines and the sessions path.
You can fix the rest of the items by the control panel.
Just visit each option and even if they appear correct save it.

Blue Man Group
There is no such thing as stupid questions. Just stupid answers