Server load 120 ???

[Devanand]

My site is down and load is 513 omg.
I got over 100 of emails for msql database error like this:

Database error in vBulletin 3.8.2:

Invalid SQL:

REPLACE INTO guest
(guestid, hostip, useragent, lastactive, spider, script, rdata)
VALUES
('8964f353640fcba57b89ds877dbh6f93', '59.39.145.178', 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; .NET CLR 1.0.3705)', 1243976302, '', 'index', 'a:6:{s:1:\"s\";s:0:\"\";s:6:\"postid\";i:0;s:8:\" threadid\";i:0;s:7:\"forumid\";i:0;s:6:\"pollid\"; i:0;s:1:\"a\";s:0:\"\";}');

MySQL Error : Table './serbian1_VB/guest' is marked as crashed and should be repaired
Error Number : 145
Request Date : Tuesday, June 2nd 2009 @ 03:58:22 PM
Error Date : Tuesday, June 2nd 2009 @ 03:58:23 PM
Script : http://www.mysite.com/
Referrer :
IP Address : 59.39.145.178


My provider said that I am geting more traffic than I can get but I had onlt 50-60 people few minutes before crash and I am on dedicated server.
All this email look same, only that IP at the and are different.
Does anyone know what can be problem?
Is msql demage or what?