Web Site, IIS vs. Authentication

Hello All,
I have problem with ma ASP.NET web sites.
I have WinXP Pro(on FAT32 file system) SP2, VS.NET 2005 And IIS 5.1. I've built my own web service page and i deployed it to IIS.
I tried to make a new web reference to that page, but i can not connect to it, because of this error:HTTP 401.3 - Access denied by ACL on resource
Internet Information Services
This error also shows in the explorer, when i want to see content of my web service page.
Can someone help me to fix this problem,please?

This indicates a problem with NTFS permissions. This error may occur even if the permissions are correct for the file that you are trying to access. For example, you see this error if the IUSR account does not have access to the C:\Winnt\System32\Inetsrv directory

Here are the solutions,

http://support.microsoft.com/kb/187506/

:)