Help! Someone broke my forum!

[No Limit]

I got a series of email alerts from a certain IP (registered to trend micro) getting database errors. Shortly after my site stopped working showing me SQL errors when I try to enter it:

http://www.leftunderground.com/content/

What can I do to fix this?

The error I get is:

Database error in vBulletin 4.1.1:

Invalid SQL:
SELECT SQL_CALC_FOUND_ROWS node.nodeid AS itemid,
					(node.nodeleft = 1) AS isroot, node.nodeid, node.contenttypeid, node.contentid, node.url, node.parentnode, node.styleid, node.userid,
					node.layoutid, node.publishdate, node.setpublish, node.issection, parent.permissionsfrom as parentpermissions,
					node.permissionsfrom, node.publicpreview, node.showtitle, node.showuser, node.showpreviewonly, node.showall,
					node.showupdated, node.showviewcount, node.showpublishdate, node.settingsforboth, node.includechildren, node.editshowchildren,
					node.shownav, node.hidden, node.nosearch, node.nodeleft,
					info.description, info.title, info.html_title, info.viewcount, info.creationdate, info.workflowdate,
					info.workflowstatus, info.workflowcheckedout, info.workflowlevelid, info.associatedthreadid,
					user.username, sectionorder.displayorder, thread.replycount, parentinfo.title AS parenttitle
					
				FROM cms_node AS node
				INNER JOIN cms_nodeinfo AS info ON info.nodeid = node.nodeid
				
				LEFT JOIN user AS user ON user.userid = node.userid
				LEFT JOIN thread AS thread ON thread.threadid = info.associatedthreadid
				LEFT JOIN cms_sectionorder AS sectionorder ON sectionorder.sectionid = 1
					AND sectionorder.nodeid = node.nodeid
				LEFT JOIN cms_node AS parent ON parent.nodeid = node.parentnode
				LEFT JOIN cms_nodeinfo AS parentinfo ON parentinfo.nodeid = parent.nodeid
				 INNER JOIN cms_node AS rootnode
					ON rootnode.nodeid = 1 AND (node.nodeleft >= rootnode.nodeleft AND node.nodeleft <= rootnode.noderight) AND node.nodeleft != rootnode.nodeleft  AND node.contenttypeid <> 17 AND node.new != 1  AND ( (( (node.permissionsfrom IN (1)) OR (node.userid =1)  OR ( node.permissionsfrom in (1) AND (node.parentnode IN (1,142,157) OR node.nodeid = 1) AND
				node.setpublish > 0 AND node.publishdate < 1299707670 ))) OR (node.setpublish AND node.publishdate <1299707670 AND node.publicpreview > 0)) AND (node.parentnode = 1 OR sectionorder.displayorder > 0 )
				
				  ORDER BY CASE WHEN sectionorder.displayorder > 0 THEN sectionorder.displayorder ELSE 9999999 END ASC,
					 node.publishdate DESC LIMIT 0, 7;

MySQL Error   : Can't create/write to file '/tmp/#sql_5ce1_0.MYD' (Errcode: 17)
Error Number  : 1
Request Date  : Wednesday, March 9th 2011 @ 04:54:30 PM
Error Date    : Wednesday, March 9th 2011 @ 04:54:31 PM
Script        : http://www.leftunderground.com/content/
Referrer      : http://www.leftunderground.com/content/
IP Address    : 70.58.230.31
Username      : No Limit
Classname     : vB_Database
MySQL Version : 5.0.91-community