Cannot Update a File.

I have purchased several new extensions recently and when I install them
through Extension Manager it errors out at the end of the progress bar and
states "Cannot Update a File. Extension will not be installed."

I have Vista Ultimate running Dreamweaver CS3 and Dreamweaver 8. I read on
some other forums that having both installed confuses the Extension Manager so
I removed Dreamweaver 8. Still the same problem. I performed some file
monitoring and noticed it was having problems with a Menu.xml file located at
"C:\Users\root\AppData\Roaming\Adobe\Dreamweav er
9\Configuration\Menus\Menus.xml".

Anyone have these issues? Nothing I have found online which resolves this for
older versions worked.