Database Error E-Mail

Hi,

I have

up the past 3 days too around 1500 e-mails saying Database Error on my Community I set up, its only been doing it the past week or so, when I click on one of the error emails, it comes up with this at the top of the e-mail:

"Database error in Community
Query:
SELECT COUNT( * ) AS `last_count` FROM `Guestbook` WHERE `IP` = '91.214.45.135' AND (UNIX_TIMESTAMP(NOW()) - UNIX_TIMESTAMP(`Date`) < 1*60)

Mysql error:
Table '/Guestbook' is marked as crashed and should be repaired

[owner] => 1
    [action] => new
    [newrecord] => comment2, swinger couples video,  5505, female ejaculation video squirting women squirting,  %-D, free video sharing posting adult,  335205, vida guerra free videos,  734, spanked in jeans video galleries,  qtvvdx, farm porn videos,  jsqdr, doggy sex videos,  zab, playboy amateur videos,  369, adult strip videos,  8[, shemale masterbation video clipes,  :-(,
    [add] => Add record"

How do I stop these errors coming? every single one is the same. I get about 5 every minute or so.

Thanks

Seems like someone is posting spam in your guestbook. Dunno what to do about the error atm, sorry..

Your dabase guestbook table is crashed, you need into your database to repair this table.
Maby some hacker has try to get make some trubbles. 
You can prevent this sort hack to remove the guestbook from your system and delete guestbook.php.