cannot find book_words.MYD

Well, here is my problem. Just a few days ago, my guestbook was working fine at mumbaikids.org. One day there was some sort of problem and I think something went wrong with my MySQL DB for guestbook. At that point I was not even able to view the guestbook. The problem was resolved but now the problem is that my browser gives me the following error message:

I have a Linux server running PHP 4.2.2 and this is the first time that anything of the sort has happened. The same error message is prompted when I try to edit the Styles or General Settings through my admin panel. I used PHPMyAdmin to check out the guestbook database but was unable to find anything recognizable, being an MySQL dummy. I navigated to the book_words table and it gave me the same message: Can't find file: 'book_words.MYD'

Please tell me how to resolve this problem without losing my guestbook entries. Thanks in advance!

Sohum Misra

In case anyone is confused, one can view the guestbook but when one tries to preview or add a message, the error message mentioned above appears.

I love the level of support here. People are really helpful when it comes to solving and eradicating bugs. Good job.