Shoutbox

Ok here is the situation.  My mum recently got a new laptop to use for her work, and asked me to set it all up for her.  We also got a new adsl modem/wireless router (A D-link DSL-G604T generation II) so i set up that at the same time.

We initially had the exact same modem/router before just without wireless.  Now once I had set everything up the old wired network was still working and I could get internet through the wireless connection to the laptop, but I couldnt seem to connect it up the the network of other computers.  When i tried turing off all the firewalls (we use norton internet security) i managed to get it sort of working but when i turned them back on afterwards it wouldnt work, at least once the laptop had been restarted.

Now i didnt view this as much of a problem as the laptop is really going to be used mostly at my mums office.  but when i set it up to work there using a belkien wireless router, i get exactly the same situation. it can connect to the internet and the other pc at the office can connect to the internet but they cant connect to each other.  Once again when i turned of the norton firewalls they would see each other but once i had turned them back on, and restarted the laptop, i wasnt able to see the other computer from both of them at all.

What do i need to do to be able to fix this.  i'm sure that the problem is going to be solved pretty much the same way in both situations but I just don't know which way to go.  Any help will be, of course, greatly appreciated.