I have not tried the latest Belkin wifi management software, but I think it's a pity that you chose to install it. From XP onwards, such software has been entirely redundant and most folk consider it to be inferior to the simple reliability of WZC (and the Vista equiv.) Windows is happier doing it that way.
Uninstall it, run a cleanup, then reinstall it with the driver ONLY.
If you're not able to get the network secured ASAP, click here and turn off the wireless. Either that or get WPA/WPA2 up and running. Long key, mix of ASCII characters and symbols, circa 20 characters in length, copied to a text file to avoid typing errors.
Oh, and read the manual from Belkin's website. It is very very simple to set up a home network and router, but if you start off wrong, you will likely go nowhere fast.