Search for this in your admin/usergroup.php
Code:
INSERT INTO usergroup (candeleteusercomments, usergroupid,title,usertitle,cancontrolpanel,canmodifyprofile,canviewmembers,canv iew,showgroup,cansearch,canemail,canpostnew,canmove,canopenclose,candeletethread ,canreplyown,canreplyothers,canviewothers,caneditpost,candeletepost,canusepm,can postpoll,canvote,canpostattachment,ismoderator,canpublicevent,canpublicedit,cant hreadrate,cantrackpm,candenypmreceipts,maxbuddypm,maxforwardpm,canwhosonline,can whosonlineip,cangetattachment)
try deleting the "candeleteusercomments, " from the query, that seems kind of misplaced to me.