So sorry about that. It should have automatically removed those files after you uninstalled.
I can help you manually remove them at this point.
What you can do is:
1) Open Windows explorer and type this into the file path: %appdata%
2) From there browse to your Adobe/Dreamweaver CS5 configuration folder
3) Find the Floaters folder and just delete anything that begins with WA_ in that folder
That should do it. Let me know if you have any problems.