iis rights to users

Hello all.
I have Windows 2003 Server who work like Domain Controller.
On a DC I use IIS 6.0 because I have internal web site. This Web
site must access from domain users via internal network and therefore
I set on IIS option “Integrated Windows authentication” for better Security.
Actually problem is that when on Workstations is Logon like a
Domain User, IIS Return error: HTTP Error 401.1 – Unauthorized.
If I Logon like a Domain Admin I have permission and web site work
perfect.
users didn’t get any details under iis in computer manage except website folder but the folder is empty.at same time in same computer if i log on as a admin these all things are working perfect

Thanks for help in advance.