DW 4 new install problem

Hi:
I got a new system and had to reinstall all programs. OS is Vista. DW4 installed and works fine. Now that I want to install my extensions from MANAGE EXTENSIONS I get and error message that tells me that DW is running (dahh) and that I need to shut it down. Even if I shut DW down and try to install from the Extension application (in my local folder) itself I get the same error message.

Also, when I tried to download Extension Manager from this site I get an error telling me I can't connect to the site? Are these all Vista issues or what gives?

Thanks ....