Hmmm... what type of router? Linksys? IF so, the default password is usually 'admin' or 'administrator'

But try 1234, 12345, 13456, or 1234567 and 0000. These are older default passwords.

If you have the user manual or can readily determine the brand of the router, go to their site and look up the manual for the default password.

Of course, if you may have changed the password when you first setup the router, use that one [img]/images/graemlins/smile.gif[/img]

Also, one last thing before you do the above... go into the control panel and then to the windows firewall. If it is turned on, turn it off and then try connecting. But from the sounds of it, it sounds like you might be trying to use your wireless network but have some type of security settings in place that were in place previously but now that you have reinstalled windows, they need to be reinputted.