]The most common error that people have mentioned was an My SQL error during installation.
Code:
Database error in vBulletin 3.0.7:
Invalid SQL: INSERT INTO settinggroup (grouptitle, displayorder, volatile) VALUES ('uttpoints', '1081', '0')
mysql error: Duplicate entry 'uttpoints' for key 1
mysql error number: 1062
Date: Tuesday 14th of June 2005 06:07:32 PM
Script: http://localhost/forum/admincp/usho...step=dosettings
Referer: http://localhost/forum/admincp/usho....php?step=start
Username: **********
IP Address: ****.****.****.****
If you have an error simmilar to this it means UCS has been installed before but not been cleanly uninstalled before, you could try removing things in the de-bug mode.
Hope It Helps.