"192.168.1.1 is rejected by my browser"
That's because there's no web server at that address.
"192.168.0.1 (the default IP for Netgear) is rejected too"
That's because all your computers are now on a different subnet and will never be able to reach that address.
I can think of two options to allow you to configure your Netgear:
1) Temporarily give one of your computers a fixed IP address of 192.168.0.100 and a subnet of 255.255.255.0 then connect it directly to the Netgear with an Ethernet crossover cable. A crossover cable isn't something you're likely to have though. Depending on your router you may find that a regular Ethernet cable will work too. You should then be able to access the Netgear's config screens.
2) Reset the Netgear again, access the config screens via 192.168.0.1, change the wireless settings to your liking then reconfigure it like you did before.