I've recently ran self-booting diagnostic software from DVD on my laptop. When it finished its job, I went back to Windows 7 and found out what my WLAN (Broadcom adapter based) kinda jammed - no longer displays broadcasted SSID list. I've cycled adapter admin-down and up w/o success and when fixed the problem by removing adapter's driver and letting Windows reinstate it. Now WLAN seems to be functional but my preferred networks list is now empty (along with keys). How can I recover it?