Can’t access from XP to Win 2000 Pro’s shared folder

Hi

I have a peer-to-peer network. When I want to access from Windows XP machine to the Windows 2000 Pro’s shared folders in another machine, it displays the Username and Password prompt. I’d like that anybody could connect to these shared folders in win 2000 pro machine without entering her/his username and password. I granted access permissions to Everyone group, but the Username and Password prompt continues appearing. How can I disable the login to access the shared folders in windows 2000 Pro?
Thanks.
Regards.