SQL data base error

[محروم.كوم]

My server host told me to optimise my tables and run a repair of the tables* now Im getting the following error come through

Database error in vBulletin 3.8.1:

Invalid SQL:

REPLACE INTO postindex
(wordid* postid* score* intitle)
VALUES
(100* 9* 1* 0)* (101* 9* 1* 0)* (1* 9* 1* 0)* (102* 9* 1* 0)* (99* 9* 1* 0);

MySQL Error : Table 'postindex' is marked as crashed and last (automatic?) repair failed
Error Number : 1195
Request Date : Wednesday* October 14th 2009 @ 12:08:16 PM
Error Date : Wednesday* October 14th 2009 @ 12:08:16 PM
Script : http://www.thespainforum.com/admincp/misc.php?do=buildpostindex

Referrer : http://www.thespainforum.com/admincp/misc.php?do=chooser
IP Address : ########
Username : #####
Classname : vB_Database
MySQL Version : 4.1.22-standard-log

Is there anyway of sorting this out* Im at my wits end and as you can imagine* just a bit stressed __DEFINE_LIKE_SHARE__