Our internet went down recently but we got it back later through the day but we couldn't connect on our other PC upstairs which runs off a wireless router. It says that we need to renew the ip address which I've tried to do using 'ipconfig/release' 'ipconfig/renew' but that does nothing. Can anybody help?

Reboot the router and then your computer. This will sort of reset the zeros so to speak. That should correct the issue.

OK detached your cable and switch off your PC modem router and wait aleast 10 sec or 20 and turn it back