I opened a case to Support, and they fixed it. I needed to delete the Configuration file and then edit the regedit, removing the CS4 entry. I did not have much in the way of customization,so it was not a big deal.
My thanks to the Suport Team.
Re-create the Dreamweaver preferences folder to eliminate problems that
a damaged preferences files might cause.
Note: When you use this solution, Dreamweaver will create a new
preferences folder and you will lose custom settings associated with
your current preferences file. However, the folder you rename in step 2
is your original preferences file. If you determine that the preferences
files is not causing the problem, then you can restore your custom
settings by following the instructions below.
Disclaimer: This procedure involves editing the Windows registry. Adobe
doesn't provide support for editing the registry, which contains
critical system and application information. Make sure to back up the
registry before editing it. For more information about the registry, see
the Windows documentation or contact Microsoft.
To re-create the Dreamweaver preferences file:
1. Quit Dreamweaver.
2. Rename the Configuration folder (for example, Configuration old)
in the "\Users\[user]\AppData\Roaming\Adobe\Dreamweaver CS4\(
installation language)\" folder.
3. Choose Start > type regedit, then press Enter, and click Continue
for the next dialog box. (note, this did not work in Win 7, had to get help to find new regedit).
4. Browse to the following location:
HKEY_CURRENT_USER\Software\Adobe\Dreamweaver CS4 and delete the whole
Dreamweaver CS4 folder then close the registry editor.
5. Start Dreamweaver. Dreamweaver creates a new preferences file.
If the problem continues, then the preferences file isn't the cause. To
restore custom settings, delete the new preferences file and restore the
original name of the previous preferences file.