Thanks to all for your previous replies.
I need a search engine to index my products on the homepage, but, when the search engine indexes the site, I get 404 errors on every page apart from the homepage.

my site so far is http://www.steeleandsons.co.uk/helpinghand

thanks

This is because you cannot place a search on the actual shop itself. Instead, create a storefront made of html and place the search on that instead.