unable to install citrix.exe in Win XP (Error 1606)

I have Windows XP with SP2 (fresh install, not an upgrade). When I
try to install the
client program citrix.exe, I get the message "Error 1606. Could not
access network location \."
I have" \\." under Data for NetworkAddress and ServerNetworkAddress
in the following Registry key:
Could this be the cause of the problem?
What should I do to correct this? I am grateful for any input.