whoever is getting limited conectivity, we need more information to see what is wrong:
goto command prompt type
This will show what IP address it is using, and your gateway / DNS servers
make sure the gatewat is on the same subnet and you can ping it.
if you can ping the gateway, check if you can ping something on the internet
like 126.96.36.199 which is google.com. if that works then try pinging Google
Sometimes if you have norton or eset running they can distrupt your network or DHCP, do you have any firewall or protection solutions? sometimes protection solutions such as norton or eset have a hidden firewall feature that is still active even when disabled.