Our company has Windows XP Pro SP2 machines that connect to an ISA 2004 proxy
server. All PCs do not require proxy for local intranet sites, but they do
for internet. All Pcs except for one will automatically send the domain
credentials to the ISA server when a internet request is made. The one that
doesn't asks for proxy authentication. If the user types their credentials
again, they can get to the internet. If they close the IE window and open it
again, they are again prompted for their credentials. This is an annoyance
and I would like to know how I can fix this. Any ideas?

Jason