I had the same problem with Dreamweaver CS4. I fixed it by deleting the configuration folder e.g. C:\Program Files\Adobe\Adobe Dreamweaver CS4\configuration - Dreamweaver will then create a new one.
Go through the blog link given below (where they've given a work around for Dreamweaver 8).
However in the comments section you can find what needs to be done for CS3 also.
Thank you all