Guestbook sql error

I have had my guestbook up and running for about month, now I get the following error message when trying to access it from link on my homepage;Query Error
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MySQL Error : Query Error
Error Number: 1030 Got error 28 from table handler
Date : Fri, October 1, 2004 19:46:26
IP : 65.197.14.91
Browser : Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322)
Referer :
PHP Version : 4.3.4
OS : Linux
Server : Apache/1.3.29 (Unix) mod_throttle/3.1.2 PHP/4.3.4
Server Name : www.

What is this error and how do I correct??
Thanks!

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