Network communication

I have a program trhat controls some equipment over ethernet with a specific tcp/ip and subnet mask.
I upgraded the program to the latest level in administrator log on and it works just fine.
However, in normal user log on the program does not communicate to the network – seems like it is a network communication problem – all works in administrator log on but not local user.
checked exceptions, turned off firewall etc.

Is there any other settings in XP to change for this or is it likely to the upgraded program.