Hi My site is down and the customers and products are gone? It makes no sense to me as all the other information is there. I was haked a year ago but installed all the changes suggested.

This is what the admin page is saying:
1016 Can't open file: 'customers.MYI' (errno: 144)
in:
[select count(*) as count from customers]
If you were entering information, press the BACK button in your browser and re-check the information you had entered to be sure you left no blank fields.

What does that mean and how did this happen over night?