Silent install - silent error

Good afternoon, dear PostgreSQL developers!

First I want to thank all of you for the great DB Server! It's really
useful, thank you!

Second, here is my question:

I want to make a silent install of PostgreSQL version 8.1 using your
recommendations on http://pginstaller.projects.postgresql.org/silent.html .
But when I use this command: "msiexec /i postgresql-8.1.msi /qb! /l*vx
"c:\pg_inst1.log" INTERNALLAUNCH=1 ADDLOCAL=server,psql,pgadmin,jdbc,docs
DOSERVICE=1 SERVICEDOMAIN="%COMPUTERNAME%" SERVICEPASSWORD="suntek"
CREATESERVICEUSER=1 NOSHORTCUTS=1", I have nothing happened except appearing
of window for 1-second with words: "Preparing to install...". Then I can
find msiexec.exe in processes with 0% CPU usage. I pasted msi log here:
http://pastebin.com/791992 (to not make garbage in the mailing list. It will
be there for one month). What's the problem, can you tell me?

I also tried the same example which is described in your silent-install
manual: "msiexec /i postgresql-8.1-int.msi /qr /l*vx "c:\pg_inst.log"
INTERNALLAUNCH=1 ADDLOCAL=server,psql,docs SERVICEDOMAIN="%COMPUTERNAME%"
SERVICEPASSWORD="SecretWindowsPassword123" SUPERPASSWORD="VerySecret"
BASEDIR="c:\postgres"". And a window appears with: "The installer has
encountered an unexpected error installing this package. This may indicate a
problem with this package. The error code is 2711.". The msi log I pasted
here: http://pastebin.com/791994

Can you advise me what I'm doing wrong, please?

Thank you very very much in advance!

P.S.: In the first case I used postgresql-8.1.msi file because I always used
it to not-silently install PostgreSQL. But in the second case I used
"-int"-file as it was described in the example at
http://pginstaller.projects.postgresql.org/silent.html .

________________________________
With respect,

Yurii Kartsev