We just got new laptops preloaded with Windows 8.1 Pro. One of the things we noticed was that there was no way through the GUI to remove wireless network profiles like you could do in Windows 7.
After some hunting around we found that the only way to remove them was through the command line. If you're looking to remove your old unused wireless profiles, here is how you can do it:
Open a CMD prompt and type: netsh wlan show profiles