[kh99]

The do_not_upload directory is part of the vbulletin download, and it shouldn't be on your server. If you don't still have the original files you can log in to the members area at vbulletin.com and download the files for the version you're running (you have to click on the "other versions" radio button to see the list).

Also, if you can execute a query (like through phpMyAdmin), then you can use this to reset your password:

UPDATE user
set password = MD5(concat(MD5('<NEWPASSWORD>'), user.salt))
WHERE userid = <USERID>

Where you'd replace <NEWPASSWORD> with the password you want, and <USERID> with your userid (usually 1 for the original admin user).