How can i get Norton to allow Windows Snipping Tool without turning the firewall off?

Am running Vista. When I try to open Windows Snipping Tool I get a box saying Snipping Tool is not working at the moment. Restart your computer etc etc.

It works perfectly OK if I turn off Norton firewall while I use it.

Can I alter anything so that Norton will let me use Snipping tool without this messing about?

Thanks for any help.