If this is a cable router and it has picked up settings from modem or adsl router, then try setting a static i.p on pc, sometimes dhcp fails.
Settings for pc nic ..
I.P = 192.168.0.2 or 192.168.1.2 <== or an i.p on same i.p range of router/modem
Subnet = 255.255.255.0
Gateway = 192.168.0.1 or 192.168.1.1 <== routers i.p
DNS = 192.168.0.1 or 192.168.1.1 <== routers i.p
Open command prompt as admin, and type ping 192.168.x.1 (gateway i.p)
Should give you 4 replies, if it works, your home network is ok.
If not, could be firewall or a setting on router, need more info on network setup.