Windows 8 is a well written OS but lacks a lot of useful characteristics, available at its predecessors. There’s no more an easy GUI way to delete the stored WLAN profiles, if they are not present available.
So, I made a solution for that, a small GUI tool called WLAN Profile Cleaner. It primary developed for use in MS Windows 8, but the program it’s also compatible with MS Windows XP, Vista and 7.
This program is free software distributed under the GNU GPL 3. For more info and downloads see at multipetros.gr/public-projects/wpcleaner/