Here is the source of the error if it helps:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<meta content="text/html; charset=windows-1252" http-equiv="Content-Type" />
<title>vBulletin 3.0 Upgrade System Step 13) Update Attachments #1</title>
<link rel="stylesheet" href="../cpstyles/vBulletin_3_Default/controlpanel.css" />
<style type="text/css">
#all {
margin: 10px;
}
#all p, #all td, #all li, #all div {
font-size: 11px;
font-family: verdana, arial, helvetica, sans-serif;
}
</style>
</head>
<body style="margin:0px">
<table cellpadding="4" cellspacing="0" border="0" width="100%" class="navbody" style="border:outset 2px">
<tr>
<td width="160"><img src="../cpstyles/vBulletin_3_Default/cp_logo.gif" alt="" title="vBulletin 3 ©2000 - 2004, Jelsoft Enterprises Ltd." /></td>
<td style="padding-left:50px">
<a href="upgrade.php"><b>vBulletin 3.0 Upgrade System</b><br />
(Please be patient as some parts may take some time)</a><br />
<br />
<b style="font-size:10pt;">Step 13) Update Attachments #1</b> (Step 13 of 42) </td>
<td nowrap="nowrap" align="right">
<strong>XML File Versions:</strong><br /><br />
vbulletin-style.xml<br />
vbulletin-settings.xml<br />
vbulletin-language.xml
</td>
<td nowrap="nowrap"><br /><br />
3.0.3<br />
3.0.3<br />
3.0.3 </td>
</tr>
</table>
<div id="all">
<p style="font-size:10pt;"><b><u>Step 13) Update Attachments #1</u></b></p>
<p>Updating Attachments...</p><ul>
<html><head><title> Database Error</title><style type="text/css"><!--.error { font: 11px tahoma, verdana, arial, sans-serif; }--></style></head>
<body></table></td></tr></table></form>
<blockquote><p class="error"> </p><p class="error"><b>There seems to have been a slight problem with the database.</b><br />
Please try again by pressing the <a href="javascript:window.location=window.location;">refresh</a> button in your browser.</p><p class="error">An E-Mail has been dispatched to our <a href="mailto:jwilk@sbcglobal.net">Technical Staff</a>, who you can also contact if the problem persists.</p><p class="error">We apologise for any inconvenience.</p></blockquote>
<!--
Database error in vBulletin :
Invalid SQL:
SELECT post.attachmentid, post.postid, attachment.postid AS attachment_postid
FROM post
LEFT JOIN attachment ON (attachment.attachmentid = post.attachmentid)
WHERE post.attachmentid <> 0
ORDER BY post.attachmentid DESC
LIMIT 0, 500
mysql error: Got error 127 from table handler
mysql error number: 1030
127 means the table has crashed you should rever tto a backup, repair and optmize all tables, and try the upgrade again.