no automatic connect to wireless network

> When I boot my computer, it does not connect automatically to a wireless
> network, and I have to use the "connect to a network" option.
> In Network and Sharing Center, Manage wireless networks several profiles are
> shown, some of those from networks that I no longer use.
> Whatever I do (move a network that I no longer use down the list, delete it,
> modify its connection properties), after a reboot, all settings are back to
> what they were. I tried to remove the profile by using NETSH at the command
> prompt, but this doesn't work either: the profile that I delete, just
> reappears after a reboot. How do I delete or change a wireless profile
> permanently?
>
> Many thanks,
>
> Cabwav