MySQL Errors?

[Dj Smuggla]

Heres the latest error i've been emailed: (1000's of them)

Invalid SQL:

                       SELECT *
                       FROM datastore
                       WHERE title IN ('','options','bitfields','attachmentcache','forumcache','usergroupcache','stylecache','languagecache','products','pluginlist','cron','profilefield','loadcache','noticecache','smiliecache','bbcodecache','mailqueue','bookmarksitecache');

MySQL Error   : Can't find file: './thebadc_db/datastore.frm' (errno: 13)
Error Number  : 1017
Request Date  : Wednesday, December 1st 2010 @ 05:09:05 PM
Error Date    : Wednesday, December 1st 2010 @ 05:09:05 PM
Script        : http://www.domain.com/showthread.php?p=42666
Referrer      :
IP Address    : 66.249.66.133
Username      :
Classname     : vB_Database
MySQL Version :

Another one:

Database error in vBulletin 3.8.6:

Invalid SQL:

                       SELECT calendarpermission.usergroupid, calendarpermission.calendarpermissions,calendar.calendarid,calendar.title, displayorder
                       FROM calendar AS calendar
                       LEFT JOIN calendarpermission AS calendarpermission ON
                               (calendarpermission.calendarid = calendar.calendarid AND usergroupid IN (1))
                       ORDER BY displayorder ASC;

MySQL Error   : Can't find file: './thebadc_db/calendar.frm' (errno: 13)
Error Number  : 1017
Request Date  : Wednesday, December 1st 2010 @ 03:27:07 PM
Error Date    : Wednesday, December 1st 2010 @ 03:27:07 PM
Script        : http://www.domain.com/calendar.php?c=1&week=1775347200
Referrer      :
IP Address    : 66.249.66.133
Username      : Unregistered
Classname     : vB_Database
MySQL Version :

And now my site wont load at all.