Take a look at this thread:
Its another user who had similar issues, that may be relevant to getting your preview working.
Your IE is installed and working correctly now, right?
I am also attaching a .bat file that you can test the preview with to see if its working. You can just double click on the .bat file to run it. To check if it worked, (depending on your operating system) you can go here to see if there is an aboutus2.png that looks like the www.webassist.com home page:
-C:\Documents and Settings\<Your User Name>\Application Data\Adobe\Dreamweaver 9\Configuration\Shared\WebAssist\Preview\
-C:Users\<Your User Name>\AppData\Roaming\Adobe\Dreamweaver 9\Configuration\Shared\WebAssist\Preview\