installation verification issue

Hello

I Just installed Reporting Services 2005 and I have a problem to make work

After installing it and setting different properties in the Reporting Services Configuration Manager, When it comes to verifying the installation, http://localhost/ReportServer or http://localhost/Reports pops up a Login Window, Where I enter Windows Account Username/Password, but this windows pops up again 3 times then I get Error page with the message:

HTTP 401.1 - Unauthorized: Logon Failed
Internet Information Services

SQL Server 2005 with SP2 is installed on WinXP SP2

What could be the reason?

http://support.microsoft.com/kb/247593|||I already tried the solution in this article, and I had the same result|||pending on how your Web site is configured, you might encounter one or more HTTP 401 errors when verifying the URL: "HTTP 401.1 - Unauthorized: Logon failed" can occur if you are running Windows XP Service Pack 2 or Windows Server 2003 Service Pack, and the fully qualified domain name of the Web site is different from the local computer name. There are several workarounds for resolving this error. For more information about the error and possible workarounds, go to http://support.microsoft.com/kb/896861.
"HTTP 401.1 - Unauthorized: Access is denied due to invalid credentials" can occur if the application pool is a local account or domain user account, and the Web site is configured to use integrated security. Because the report server virtual directories use integrated security by default, you can expect to encounter this error when you access the report server. For more information about the error and possible workarounds, go to http://support.microsoft.com/kb/871179.