منتدى استراحات زايد - Database errors, no idea where to look

I got the following in my inbox today, along with complaints from a few users that they weren't able to access their User CP or certain threads. I've recently modified functions_reputation.php and postbit/postbit_legacy, but I changed it back to its original form and it's still giving me errors.

Help would be very appreciated, as I don't have any idea where to begin.

PHP Code:

Invalid SQL:

SELECT
reputation.whoadded, reputation.postid, reputation.reputation, reputation.reason, reputation.dateline,
user.userid, user.username, post.threadid, thread.title
FROM vbreputation AS reputation
LEFT JOIN vbpost AS post ON (reputation.postid = post.postid AND post.visible = 1)
LEFT JOIN vbthread AS thread ON (post.threadid = thread.threadid AND thread.visible = 1)
LEFT JOIN vbuser AS user ON (user.userid = reputation.whoadded)
WHERE reputation.userid = 125

ORDER BY reputation.dateline DESC
LIMIT 0, 9999;

MySQL Error : Got error 127 from storage engine
Error Number : 1030
Request Date : Friday, July 10th 2009 @ 02:41:50 AM
Error Date : Friday, July 10th 2009 @ 02:41:50 AM
Script : usercp.php
Referrer : forumdisplay.php?f=8
IP Address : :eek:
Username : :eek:
Classname : vb_database
MySQL Version :

PHP Code:

Database error in vBulletin 3.7.2:

Invalid SQL:

SELECT post.postid
FROM vbpost AS post

WHERE post.threadid = 336
AND post.visible = 1

ORDER BY post.dateline
LIMIT 20, 10;

MySQL Error : Got error 134 from storage engine
Error Number : 1030
Request Date : Friday, July 10th 2009 @ 01:51:04 AM
Error Date : Friday, July 10th 2009 @ 01:51:04 AM
Script : showthread.php?t=336&page=3
Referrer : forumdisplay.php?f=22
IP Address : :eek:
Username : :eek:
Classname : vb_database
MySQL Version :