Not my solution but found it in another forum
"Try this...
http://www.css.ap.sony.com/vaio/down...1181800-UN.exe
My wireless switch utility disappeared as well. I had to install a "newer" version of the switcher utility at the URL above and now it works like a charm...
Give it a try!"
The link did not work directly but I googled 'SOAWSU-01181800-UN.exe' and it brought me to the
sony website.
I am going to give it a try and see if it works.