[bit_4_bytes]

I recently bought a router (to replace my switch), now my HP Pavillion cannot see my Toshiba laptop. They're both running Windows XP, would the firewall and anti-virus be keeping the Pavillion from accessing the Toshiba? What could be the problem here? Could it be something in the router settings?

[Neil Jones]

The router itself won't do any transferring, its just a dumb terminal. But your firewall is more likely to be blocking local traffic.

[98springer]

If you make a change (switch to router) and things don't work as they did before the change. Check the thing you changed.