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How can I uninstall this? I got a database error when I removed the product and wanted to change usergroup permission. In my Usergroup Manager I have empty fields now and when I make changes (e.g. Forum Viewing Permission) I get the following error:

Database error in vBulletin 3.7.0 Beta 3:

Invalid SQL:
UPDATE vb_usergroup SET

### UPDATE QUERY GENERATED BY fetch_query_sql() ###
`title` = 'Registered Users',
`description` = '',
`usertitle` = '',
`opentag` = '',
`closetag` = '',
`passwordexpires` = '0',
`passwordhistory` = '0',
`forumpermissions` = '3928575',
`genericpermissions` = '1579685575',
`attachlimit` = '0',
`pmquota` = '50',
`pmpermissions` = '3',
`pmsendmax` = '5',
`calendarpermissions` = '63',
`wolpermissions` = '1',
`adminpermissions` = '0',
`genericpermissions2` = '1',
`genericoptions` = '62',
`profilepicmaxwidth` = '100',
`profilepicmaxheight` = '100',
`profilepicmaxsize` = '65535',
`avatarmaxwidth` = '80',
`avatarmaxheight` = '80',
`avatarmaxsize` = '20000',
`signaturepermissions` = '137215',
`sigpicmaxwidth` = '500',
`sigpicmaxheight` = '100',
`sigpicmaxsize` = '10000',
`sigmaxrawchars` = '1000',
`sigmaxchars` = '500',
`sigmaxlines` = '0',
`sigmaxsizebbcode` = '7',
`sigmaximages` = '4',
`albumpermissions` = '3',
`albumpicmaxwidth` = '600',
`albumpicmaxheight` = '600',
`albumpicmaxsize` = '100000',
`albummaxpics` = '100',
`albummaxsize` = '0',
`usercsspermissions` = '31',
`visitormessagepermissions` = '63',
`socialgrouppermissions` = '115',
`photoplogpermissions` = '21455',
`photoplogmaxfilesize` = '512000',
`photoplogmaxfilelimit` = '100',
`mgccustomusergroupperms` = '0',
`nbmsgshowchatbox` = ''
WHERE usergroupid=2;

MySQL Error : Unknown column 'mgccustomusergroupperms' in 'field list'
Error Number : 1054