Run the pages you've made with Word through HTML Tidy, http://www.w3.org/People/Raggett/tidy/ , it'll become much easier to add your own pieces of code because Word really messes the code up!
HTML Tidy is the semi-official validator/code-tidier from the World Wide Web Consortium. It operates in command line and has got a special switch for tidying Word documents (the code is that bad in those, really).
Tidy also helps with pages made with other tools and by hand.