You can first of all uninstall the linksys easylink advisor through the add remove program under control panel.
Restart your computer. Open Internet Explorer and in the address bar type 192.168.1.1 and press enter.
Click on wireless tab on top. The network mode should be on mixed. Change the ssid to your preferred name. Leave the wireless channel on 6 (some numbers after that). Wireless Broadcast should be enabled. Now click on save settings. (Click on continue if it ask you or wait till the page refreshes back showing the updated settings).
Now below the wireless tab on top click on the sub tab "wireless security". Click on security mode pulll down menu and select WPA PERSONAL. Select the algorithm from TKIP to AES (this will enhance the wireless security of WPA). In the WPA Shared Key type any password consisting of numbers and letters (minimum 8 charachters length and maximum can be 64 charachters...but do not make a very long password that you would not remember). Now click on save settings (follow the same rule).
Now click on "Advanced wireless settings" (fourth and the last one) sub tab on top and change the Beacon Interval from 100 to 75. Change the Fragmentation Threshold from 2346 to 2306. Change the RTS Threshold from 2347 to 2307. Click on Save Settings (follow the same rule).
Unplug the power from the router for 20 secs approximately and power it back up (also known as powercycle).
Check first connecting your computer hardwired to the router's any number port on back (check if the light comes on on the router front panel). if you are able to go online (if not then unplug the power from modem for a minute and power it back and wait for another minute and check the internet connection).
If you are online through wired connection then unplug the cable from your computer to router and keep a minimum of 3 feets of distance between the router and computer (at times when very much the router there is a dead spot for wireless signal) and try connecting wirelessly on your now secured wireless network. when prompted for network key or wpa shared key box then enter your wireless password you had set on router. click on connect and wait till it shows you that you are connected. you can now close down this screen and check through your internet browser by going to different websites and you should be online.....
Hope the above steps help you to connect wirelessly on your secured wireless network.....