Reload wireless network list

Hello,
NetworkManager seems not reloading correctly my network list.
Sometimes I see twice my network point (one with WEP encryption but now I've changed to WPA2) and if I turn off my router, I still see my network
Also the strength of the signal is not always updated if I move with my laptop.
How can I reload the network list.
I don't mind doing command line
Thank you

O.K. Then doe these steps.
1. Turn off the Airport card!
2. Open System Preferences->Network.
3. Delete the Airport connection in the left hand column.
4. Immediately reboot.
5. Open System Preferences->Network and in the left hand column hit the + sign and re-add the Airport card.
6. Immediately reboot again.
7. Upon the restart open System Preferences->Network and rejoin your wireless network.
Please don't panic and remember to reboot after the deletion and re-adding of the Airport card. Just remember when in the Network pane to add the Airport Icon in the menu bar again. Plus when in the Network pane also look at the top of the pane for "Location". Use the pull-down to create a custom Location callin git whatever you want, then hit the 'Apply' button.
Good Luck.

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