Unable to send e-mail SMTP error message

Hello,
Hope someone here can help me with this error message
I have installed Drupal software on my windows Vista machine. I am logged in as an admin. As per instructions, I have the SMTP module already installed. Now when I try to perform any action on Drupal, I get the following error message
Unable to send e-mail. Please contact the site administrator if the problem persists.
What email or which administrator is it referring to? Do I need to install something else on this machine?
