But aside from that, table layouts are really outdated and you're likely to have a lot of problems trying to make that approach work with WP. I know it's a lot of work to totally convert to a CSS based layout, but in the long run, it will be worth your while. Your tables are also using a lot of deprecated inline CSS code -- again a huge problem in terms of maintaining the site and long-term functionality.
You also have some major errors with the title and body tags -- so the validator won't even finish validating the page:
No matter what, fix those and then see what other errors you really need to fix.