troubleshooting Postgresql on Windows

Hi

I recently read some of your windows docs on the wiki.
They mentioned that some people experience problems with Postgresql and
firewalls and/or anti-virus programs on windows.
I know that a software firewall is usually not a problem. I have used a
couple of different software firewalls at different times
and they usually prompt you to ask if you want to allow this program to
access the internet.
Hardware firewalls are a different story however. That's why I rather
disabled my adsl router's firewall and I am using a software
firewall. As far as anti virus programs go according to the wiki you can
disable scanning of certain folders or executable files.
What sort of problems do firewalls and anti virus programs cause?
Do they cause the installation of Postgres to crash?
How will you know if a problem is caused by a firewall and/or anti virus
program?
Will Postgres work as an embedded database on windows?
Won't I have lots of support calls with users not being able to install
Postgres on Windows?
Is it possible to write my own installation routine for Postgres under
windows?
Where would I find such info?
I think I did read somewhere on the web that the one click installer does
allow you to do an unattened installation?

Thanks

H.F.