1) Go to Start and click on Control Panel.
2) Proceed to click View network status and tasks in Control Panel window.
3) Network and Sharing Center window will appear, proceed to click Manage wireless networks on left panel.
manage wireless networks in Windows 7
4) Manage Wireless Networks window will appear, and here you can see all available wireless network connection profiles. Select the profile you don’t use anymore, click on Remove to delete the selected profile. That’s it!