should I manually correct database after fail upgrade step? and how?

I dropped the database, re-imported it, and ran the script again. Again, the same two updates failed.

what I don't understands is what exactly to alter and how. like many, I use phpadmin.

(edit)

Here's some more informartion from 128 to use as an example:

----this is the 4.6.8 sql table---

CREATE TABLE term_node (
  nid int(10) unsigned NOT NULL default '0',
  tid int(10) unsigned NOT NULL default '0',
  KEY nid (nid),
  KEY tid (tid),
  PRIMARY KEY (tid,nid)
) TYPE=MyISAM;

---this is the original 4.6.6 table---

CREATE TABLE `term_node` (
  `nid` int(10) unsigned NOT NULL default '0',
  `tid` int(10) unsigned NOT NULL default '0',
  PRIMARY KEY  (`tid`,`nid`),
  KEY `nid` (`nid`),
  KEY `tid` (`tid`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1;

----this is the update script----

function update_128() {
  $ret = array();

  if ($GLOBALS['db_type'] == 'mysql') {
    $ret[] = update_sql('ALTER TABLE {term_node} ADD PRIMARY KEY (tid,nid)');
  }
  elseif ($GLOBALS['db_type'] == 'pgsql') {
    $ret[] = update_sql('ALTER TABLE {term_node} ADD PRIMARY KEY (tid,nid)');
  }

  return $ret;
}

-----this is the failure warning---

2005-03-21

ALTER TABLE {term_node} ADD PRIMARY KEY (tid,nid) 
FAILED

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