BUG #5951: ERRO NO INICIO DA INSTALACAO

The following bug has been logged online:

Bug reference:      5951
Logged by:          DIEGO BALAN
Email address:      diegobalan@hotmail.com
PostgreSQL version: 9.0.3-2
Operating system:   WINDOWS 7 X64
Description:        ERRO NO INICIO DA INSTALACAO
Details:

aparece a mensagem "please provide a password for the database superuser and
service account. if the service account already exists in windows, you must
enter the current password for the account. if the account does not exist,
it will be created when you click nex" quando eu tento instalar o programa,
bem no inicio da instalacao, mas eu nunca instalei o postgree no pc, e o
windows nao esta com senha de usuario? o que fazer???