Users need to log in

Hi

I have a company intranet running on a Windows Svr 2003 box. I have created
the intranet and it can be viewed by users running Windows from their PCs.

However, I have a number of users that access the intranet via a Citrix
Metaframe XP environment (the Citrix Farm is also on Win Svr 2003). When
these users attampt to get to the homepage they are prompted for a username
and password? Does anyone know why this would be different and how i can
change it?

Point to note: This did work perfectly when the Citrix Server was on Win
2000 Svr.

Thanks

Steve