Has anyone seen this problem before?

I am installing the Novell client and Zen Desktop on a Windows 2003 R2
server. The Novell client install goes without a hitch but once I install
Zen Desktop and reboot the machine, the Novell client does not come up. I
get the Windows client back.

What I end up doing for now is login to the local Windows server and then
bring up the Novell client and login to that. Once I am logged in to
both, I can run Zen's NalWin32.

Does anyone know how I can disable the Windows login and just have the
Novell client login?