Because I google-searched a bit for dfsvc.exe I knew it was something about windows framework. so I just did what I read in this
topic and now the error is gone BUT i cant install WAU anymore.
when I try it with IE at this page: http://www.wowace.com/wau/publish.htm
and click "Install" just nothing happens.
and to install it with the zip file doesnt work, too.