How can I disable the Wireless Utility from vendor, and use the Windows WZC service?

Click Start –> Run, Type “msconfig” and click OK,  Go to the tab 'Startup'
Uncheck 'Wireless LAN Utility', Click Apply and OK
Reboot the computer

Then you go to Start -> Control Panel -> (Performance and Maintenance) -> Administrative Tools
Double click Services and look for the Wireless Zero Configuration.
Rightclick it and click Properties.
Set the Startuptype to 'Automatic' and press Start
Click Apply and OK.

Right click the wireless connection, select 'Status' and click 'Properties.
Select the tab 'Wireless Connection'
Check the option 'Use Windows to configure my wireless connection'.
Click OK and restart the computer.

Now you can use the standard Windows Utility to configure your connection.