solved it indeed.. might be an easier way than this, though: in windows: run > mmc.exe > hit ctrl-m, choose "Local users and ..." and click add>, click local machine> okay > ok. in the left menu, click at groups.. there your list is [;)] add your user to the "sophos administrators" group, and done.. now I could stop the services(couldn't even do that before adding my own account to the soophos admin group)