installation automation

Hi,

I am developing an open source healthcare information system and in
order to appeal to physician practises I need to have a 5 click
installation process - 4 nexts and one finish...

The only item I am not able to do this with on Windows is PostgreSql
(which having worked with Oracle for years, this software is superb).
Linux is fine.

The biggest problem is the creation of the user login, service, password etc.

What I am going to test soon is can I simply unzip the contents of
Program Files\PostgreSQL\8.2\... and start the database server via a
shell script?

Or are their registry or other configuration that the installer does?

Since my software uses JBoss, starting the database server when the
application server starts is not too big a deal - for the demo at
least.

thanks

Greg

PS I think I can get around it but one of the other issues is the
automatic disabling of standard username/password for security i.e.
psql -U username database -f mydbcontents.sql fails by default. I
believe I had to edit conf files though it was a while ago on Windows.