I have two windows xp machines. Both can see each other, but my laptop will not logon to the desktop. When I try, the place for your user name is greyed out and 'computername'Guest is stuck there where I should be able to type my name in. Password field is fine. The desktop to this system does not have this problem. I suspect it's because I briefly used this as part of a domain when I was toying with samba's domain controller features on the fileserver. However, I switched it back to regular networking, and I can log into other computers without having this problem.