Okay a couple of issues here.
I visited your site it states no forums to view.
When you ran the upgrade you had the option to use a prefix maybe you skipped it.
The default prefix now is UBBT_
Check to see which set of tables have data. If it is only w3t that has data then you can use that if you want
Print out the existing file config.inc.php so you don't loose track of what you change.
Edit the file look at the first 5 lines or so to make sure your database connection settings are correct and change the table prefix to w3t_ if that is what you want.
Also your Admin folder and subfolders should be at
http://www.bracket-racing.com/ubbthreads/admin
