Vista - Localhost authorization problem

I've been trying to use ISS, and discovered that when I try to browse to
localhost, or try to browse my wwwroot sites from inside IIS, I get the error
message below. I also found that Dreamweaver isn't able to access the
websites inside the wwwroot directory. Any suggestions on what to do would
be appreciated. I have already tried deleting IIS, rebooting, and then
reinstalling it, but nothing changed. Thanks for your help.

HTTP Error 401.1 - Unauthorized
Description: You do not have permission to view this directory or page using
the credentials that you supplied.

Error Code: 0x8007052e

Notification: AuthenticateRequest

Module: AnonymousAuthenticationModule

Requested URL: http://127.0.0.1:80/

Physical Path: C:\inetpub\wwwroot

Logon User: Not yet determined

Logon Method: Not yet determined

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Larry S