If you are using Windows XP with SP2, I would suggest you uninstall the Belkin software via Add/Remove in Control Panel.
Then go into Device Manager, expand the "Network Adapters" category, click the "View" menu and select "Show Hidden Devices". Then uninstall all items which relate directly to your Belkin USB Adapter. You may have to reboot after doing this. Reboot *without* the USB adapter attached.
Once running, plug the adapter in and let Windows "find new hardware". Follow the wizard and select the option to install from a specific location. Insert the CD, but *DON'T* run it. If it starts automatically, exit again. Continue with the wizard and browse to the "Drivers" folder on the CD from which Windows should install the adapter WITHOUT the Belkin wireless software.
If the Wireless Network Connection in the Network Connections folder has a silly number such as 16, just rename it to get rid of the number at the end.