New laptop using belkin n wireless router using McAfee security

you need to set the password in your computer's network connection as well:
control panel --> network connections --> wireless .
find your SID network and delete it.
then re-scan for network connections and when it finds it will ask for the password.
enter the password and you should be good to go

check in router the option NAT, unchek some place that say limited host or something like that

Hi Thanks for your question
I think my tutorial may help you with this please click this link----> http://www.fixya.com/support/r4695161-change_wireless_network_password_forgott

Because of the fact that you can connect to your network without cable since it's unsecured you don't need to connect by cable. Skip this part and carry on with going to the routers settings site then to router wireless settings and password change. Remember to choose WPA method of security. Good Luck and please let me know if this was any helpful.

Remove the neighbor's network from the preferred network list.
add your own network in the list. If your router is old router then upgrade the firmware of the router. Firmware is the software of the router.
You have connected your laptop to the router, to secure the wireless network. When you connect the laptop to the router, make sure that the wireless network connection will be disabled.
Once you change the wireless settings, enable the wireless connection and connect to your network.

Your laptop must be a wireless computer. You want to secure the wireless network.
You will need to change the settings on the router.
First you will need to connect the computer to the router with the cable. Do you have any computer connected to the router ?
If not then connect the laptop to the router. Open the set up page of the router and change the wireless security settings of the network. Change the wireless network name also.
Click here for more information about the router and internet

The wireless settings in the Belkin has been setup with encryption.
You can restore the Belkin back to the factory default by powering up the Belkin and press the RESET button for 7 secs.
It is not wise to leave your wireless router unsecured, anyone can access your network and Internet connection and use up your allocated download limit. Once you exceed your download limit you could be slug with addition charges - this depends upon your contract with your ISP.
For details on securing your wireless router and configuring the wireless card in the laptop, please click on this link and follow my instructions :-
http://www.fixya.com/support/r3559128-wireless_router_security

To setup a secure wireless network and configure the laptop's wireless card to communicate with the wireless router, please follow my instructions on this link :-
http://www.fixya.com/support/r3559128-wireless_router_security

You have to go into the setup for the router. Most default to the 192.168.1.1 IP address. You would type that address into your internet browser and hit enter. Then you will be asked for a name and password. If you have your belkin manual it will tell you the default name and password. Once in the settings you can change the password. You can also turn off SSID broadcasting, enable the highest level of security that your particular router supports in conjunction with your computer and enable MAC authentication. If you enable MAC authentication you have to type in the MAC address for each device you wish to have access to the router.

you have to check if you have the wep key enabled. when you put in the wep key, it should also be enabled so that your wireless network should say security-enabled wireless network. make sure to disconnect and connect again on your network after changing the settings to refresh your connection. hope this helps.

If router is brand new you should have a set up disk. the set up disk will walk you through it or you might log onto Belkin site to see a walk through set up. If you can access internet from modem to router to internet. That means router is functioning properly. To go completely wireless you will need to secure your network and setup your access codes. Definitely use the setup disk to do this. A unsecured wireless network is a nightmare waiting to happen. Good luck