Well fun & games.

Have tried to access the other networks no joy, there are two unsecured but I wont touch them, I take it you meant the networks that keep popping up as (ssids).
Changed channel No 11 to 6 and from AD HOK to the others with different
Settings after more than two hours gave up
Mixed mode protection (roaming aggressiveness) (transmit power) full.
Regardless of what I try it keeps reverting back to (AD HOK) channel 11.
Rebooted laptop with each change where am I going wrong.
Fionao lives opposite our house top flat signal must be going straight over me.
Twice I had to shut down could not connect due to main router was offline rebooted
came back up still with the same guests will get a cable this week and sort laptop out later.