Hello, urgent problem....

W2K3 server, with CITRIX Presentation Server 4.0, Novell Client 4.91 NMAS
NICI, sec login 3.5 client.
NO MS SP 1, but all actual hotfixes...


When installing ZFD 6.5 workstation agents, the system will not present a
logon gui after reboot. Can ping system, no RDP or ICA connection possible.
Can see only mouse pointer, no shutdown reaction when ctrl+alt+del.
Without ZFD Client, everything works fine. Problem is reproducible......
Can't find anything in knowledgebase or elsewhere.
"Funny" situation: when trying to install zfd sp1, the installation
procedure requires installed zfd 6.5 for update, but with this, the system
is "dead", as described !