problem with windows installer

Hi list,

i just wanted to delete my sandbox version of postgre and install the "real" postgresql-database. unfortunately, the windows installer doesn't want to start and keeps telling me that the windows installer service could not be accessed. Strangely, i can start any other installer on the same machine (win 2003 server). Even stranger, on my local workstation i can start the very same installer.
Does anybody have an idea why this is happening?

--
Christian Rengstl M.A.
Klinik und Poliklinik für Innere Medizin II
Kardiologie - Forschung
Universitätsklinikum Regensburg
B3 1.388
Franz-Josef-Strauss-Allee 11
93053 Regensburg
Tel.: +49-941-944-7230