hi,
this is how I normally would launch silent install of postgres from command line.
msiexec /i postgresql-8.2-int.msi /qr INTERNALLAUNCH=1 ADDLOCAL=server,psql CREATESERVICEUSER="1" SERVICEPASSWORD="SecretWindowsPassword123" SUPERPASSWORD="J2Fntiaj" BASEDIR="c:\postgres"
but am having a bit of trouble inside of installer. also omitted everything to the left of "/qr", still no luck.