Can you see the content in the dreamweaver window then?
What happens when you open the frameset file from the browser by going "file>open" instead of previewing from dreamweaver?
One thing I will say, before we go through creating a frameset from scratch, is that at the moment your smaller, fixed page is the content and the header is going in the larger, expanding section. Swap the frameset figures around from rows="*,170" to rows="170,*"
If none of these fix it, create a new file, open the objects panel, choose to view the frames set of buttons and click on the third button (top fixed, bottom stretch). Open the frames panel and the properties inspector. Click on the topframe in the frame panel and in the properties panel, choose the "src" of the file for your header. CLick on the bottom frame and do the same. Then "file>save frameset as"
This is the fastest way. Derren
[Mediocre talent - spread really thin]