[GENERAL] Upgreade 8.3.0 to 8.3.1 on windows: insufficient privileges to install system service

Hello !

I obtain an error message when I launch the upgrade.bat on windows 2000
server using an administrator account (the one used to install postgresql
8.3.0): insufficient privileges to install a system service.
I log in with VNC, and I have the same message using Terminal server.
Is this a problem with the installer or with my configuration ?
What could I do or check to avoid this message ?

I did not have this problem on my development server which is identically
configured (appart the fact I do not use a distant connection)

Thanks

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