Further to the below, I forgot to mention the PCs have NW client 4.83 sp3
and Zen agent 4 installed.

Can anyone help ?

I upgraded a zen 4 Server to Zen 7 & we are now upgrading the netware
and zen agent on the workstations. We are using NAL applications for this.

I have been able to upgrade PCs with XPsp1 but when I try PCs with XPsp2,
all the NAL apps fail. The error mentions that the system cannot
find the path. I am not running any group policies or XPsp2 firewall
either. I have tried using a DNS name in the path and a drive mapping
instead of UNC, but it hasn't worked.