If your list of wireless networks looks like this:
I’ll show you how to fix it.
- Use your favorite search engine to find the Sysinternals utilities for download from Microsoft. You need the movefile utility. It may come with the pendmoves utility also.
- Unzip the download and open a command prompt
- Type the following into the terminal (replace with your username, of course!):
movefile.exe "C:\users\<username>\Local Settings\Application Data\Microsoft\Windows\usrclass.dat" usrclass.old
- Restart your computer. Your Manage Wireless Network list should now include your wireless networks.
Why does this work and what caused the problem in the first place? I have no idea.
I found this solution on this Microsoft answers website which in turn links to this Microsoft KB article.