Database error - PLEASE HELP!

[Chachacha]

Ok so I've done NOTHING with my forum. I went to bed last night and everything was fine. I get up this morning and I get a white page with "Database Error" on it. I looked at the page source for that page and this is what it shows...



Database error in vBulletin :

Invalid SQL:

SELECT *
FROM datastore
WHERE title IN ('','options','bitfields','attachmentcache','forum cache','usergroupcache','stylecache','languagecach e','products','pluginlist','cron','profilefield',' adv_modules','adv_portal_opts','adv_portal_page',' adv_portal_tpst','attachmentcache','bbcodecache',' birthdaycache','eventcache','iconcache','maxlogged in','rankphp','smiliecache','userstats');

MySQL Error : Can't find file: './******/datastore.frm' (errno: 13)
Error Number : 1017
Date : Monday, November 3rd 2008 @ 05:56:04 AM
Script : ******
Referrer :
IP Address : ********
Username :
Classname : vB_Database



What can I do to fix this besides a backup? I have a fairly large forum and i need it back up asap! Please help.

v3.6.4