Originally Posted by James99
WEP is fairly easy to crack but WPA is more secure and WPA2 is solid. Just about all router support WPA2. Did you set up encyption when you set up your router? If not, go to your address bar and type in the URL: 192.168.0.1 which should take you to your router settings. leave the password field blank and go to wireless settings and create a password for your network. If you want even more control you can set up access control and speifically block your neighbor but that wouldnt really be necessary if you just create a network password. Let me know if that helps at all.
You are making too many assumptions about their router config.
OP: Your router's address might not be 192.168.0.1. To find it, open up cmd and type in "ipconfig /all" (without the quotes). Then look for the Default Gateway. That will be your router's IP address. Type that into your browser and it should bring you to the config page for your router. Then enter the username and password (it could be anything really, but the default is probably something like username: "admin", password:"admin" or a blank password. Try a few different combinations, and if you can't figure it out, you can either look in your router's manual or look online for it).
Once you've logged into your router's config page, definitely look for the security settings and make your password use WPA2 encryption if possible. If the highest encryption your router supports is WEP, then I'd recommend turning on MAC address filtering. MAC address filtering requires a little more work to connect new devices, but it prevents anything connecting that you haven't specifically allowed. If you can't increase your password's security, post back and someone can probably explain MAC filtering a little better.