How do I delete a previous made usename without a password after making a new on

[dellakit]

I made a new connection with a password.
And I have deleted the old connection on the "Manage wireless connections"
But the old connection still appears on the Wireless connections.
I don't want my neighbors to connect to the old one since it has no password, and I can't figure out how to delete it. Please help me. thank you

I'm using Windows 7 btw.

 

[Emerald]

do you have Guest account on the router?

have you tried changing your SSID?