Vnc Viewer 4.1 - Connection refused

[Dave]

I have Vnc 4.1 running on Windows XP
Both the desktop & Laptop tops have identical Servers And Viewers
I can view the laptop from my Desktop with no problem
but if I try and view the desktop from the laptop then it says Connection
refused
I'm not using any password, the firewalls are Windows own & I use a Belkin
Adsl modem/router
As far as I can see the settings on both machine are the same

Can any-one help ?

Thanks

Dave Harris