Using the administrative C$ share

I'm developing an application which remotely installs a service. This is
done by copying the service files' to the c$ share on the target
machine, connecting to scm, installing and starting the service, which
worked fine for all >= windows nt systems.
Now, I experienced serious problems doing this in Windows Vista (Vista
Ultimate, Build# 6000):
as it seems, the C$ share and the SCM can only be accessed remotely by
the user 'Administrator' (not by any other user which is member of the
'Administrators' group), which is disabled by default.
I also generally wonder how remote network administration may work in
this scenario.
Any help would be greatly appreciated.

Holger