I seem to be having a DB problem. I have not worked on the database at all. Yesterday all was fine. Today when I open the admin page I get the following error message "#1016 - Can't open file: 'orders.MYI' (errno: 144)"

I assume this is a DB problem (although I know next to nothing about SQL). I logged in to PHPAdmin to check my SQL DB. When I try to open the "orders" table I see the same error message.

I can't process orders until this is fixed. Any suggestions are greatly appreciated.