Question: Can i design a website in dreamweaver and have only certain pages that will go to a drupal area which will use some of the social networking components OR do i have to have the entire site built as a drupal site?

Answer: You can build a static website and then link to Drupal as another section of the site. Let's say you build 'www.mysite.com' in Dreamweaver and you want to add a community function. You could always load the drupal files into a sub-folder called community and have your community located at 'www.mysite.com/community'.

The key to pulling this off and doing it well is to have the two sites styled in an identical, or at least very similar manner. You'll probably want to understand how Drupal themes work so you can skin the Drupal portion of your website to look like the existing site. So I recommend that you review the Drupal theming guide and also have a look at the Zen theme which is a very clean starting theme that you can alter via CSS.