I manage my school website using dreamweaver 4 and am fairly okay at using it now- last 3 years- did the one before that in frontpage and i started the first website 8 years ago in Publisher no less. Anyhow it is bothering the hell out of me as i cant work out how to easily add video- does it need to be a particular file type- I have various books and have studied no end but i CANNOT work it -can anyone help please?? most grateful if you can

What kind of video are you trying to add? You generally add video under insert/media...then you choose the proper method for the video you are adding from the drop down menu.
Good luck,