I can not start that command because:

C:\Program Files\PostgreSQL\8.3\bin>initdb -D ../data
The program "postgres" is needed by initdb but was not found in the
same directory as "C:\Program Files\PostgreSQL\8.3\bin/initdb".
Check your installation.

In the same time there are 2 files with that name:
C:\Program Files\PostgreSQL\8.3\bin>dir postgres.*
Volume in drive C is ACER
Volume Serial Number is 7C12-D67C

Directory of C:\Program Files\PostgreSQL\8.3\bin

01.02.2008 г. 04:00 ч.         3 661 824 postgres.exe
01.02.2008 г. 04:00 ч.         1 092 970 postgres.lib
               2 File(s)      4 754 794 bytes
               0 Dir(s) 110 786 924 544 bytes free

Miro.

Dave Page wrote:

On Mon, Feb 25, 2008 at 3:39 PM, Miroslav Nachev <miro@space-comm.com> wrote:


 To get up and running though, you should be able to install with
initdb disabled and then run it manually from the commandline.

 How to do the above?


When you install, un-check the initdb option on the initdb page of the
wizard. Then, initialise the cluster after installation by running a
command like:

initdb -D ../data

from the PostgreSQL command prompt window (there's a shortcut on the
start menu). See
http://www.postgresql.org/docs/8.3/interactive/app-initdb.html for
more info on the initdb options.

Once that's done you should register PostgreSQL as a service - see the
'register' mode of pg_ctl:
http://www.postgresql.org/docs/8.3/interactive/app-pg-ctl.html

Those steps are roughly what the installer normally does for you.