What does this mean and how can I fix it?

[groovesalad]

Database error in vBulletin 2.3.0:

Invalid SQL: SELECT COUNT(*) AS threads FROM thread
mysql error: Can't open file: 'thread.MYI'. (errno: 145)

mysql error number: 1016

Date: Monday 08th of September 2003 03:48:03 PM
Script: http://groove-salad.com/forum/forum/
Referer:

[lasto]

upload repair.php to your admin folder and run it

Im not the best to help so read this first

http://www.vbulletin.com/forum/showthread.php?threadid=69803