If enabling/disabling wlan works when wbutton.exe is running (for
reference, that exe is always running on my Acer C300), then you can
add a link to the .exe into Start=>Programs=>Startup folder.
Alternatively, start regedit and add into
a new string value named Wbutton, with the contents
"C:\Program Files\ACER\Launch Manager\Wbutton.exe"
(or where your exe is).
Or just go to the Acer support site
and download then reinstall the notebook manager tool. Maybe the
wireless change tool, as well. I can't speak for the C100 but if
you've and old BIOS then a BIOS update might help too, at least in
the C300 series it fixed flaky wireless (but may not be the case for