go to user account in windows vista/7 and create a new account. create a limited account and use it for your daily activities (you may find the uac prompt annoying sometimes) when you trying to do something taht requires admin level permissions. use a password on both account (admin and limited). enable WPA2 on your wireless router, you can do that by entering your ip address in your web browser and it will take you to a page on your (ISP) internet service providers site, from there you can change diffrent settings like your password and more.
its very easy to get your ip address, take a look on the bottom of your post>>>>>tada
What you'll need to do to change the WiFi settings is go to the IP address of your router. This will be the "Default Gateway" on the laptop. I assume the other two machines connect to the same router, but with cables, right? If so, this can be done on any of your machines, and the Default Gateway should be the same as well.
To find the default gateway:
Start - Run - Type (no quotes) "Cmd" - Press Enter - Type (no quotes) "Ipconfig" - Press Enter - Find the correct Network Adapter and the Default Gateway will be listed.
Now, lets assume for this example that the Default Gateway is 192.168.2.1.
Now in a web browser (Internet Explorer) browse to
http://192.168.2.1You will probably be prompted for a user name and password, and the default ones are probably on the label on the router itself.
Now you're logged on to the router. You should see a bunch of options on the lefthand side of the screen, click on Wireless.
From there I think it's Security, where you should be able to pick WPA2 as your encryption type. (See page 57 of your user manual
http://www.belkin.com/uk/support/article/?lid=enu&pid=F5D7234uk4&aid=14386&scid=0)
NOTE: If you have a Nintendo DS, or DS lite and you want to be able to connect that to your WiFi, you will need to use WEP. This does not apply to the DSi.
Once you have done this you will need to enter that password on each of your devices that connect via WiFi. If you have any problems, let us know.
Also, regarding the secondary user account:
Yes, that's what I'd recommend. It just puts another layer between you and getting a vulnerablity exploited.