If you have configured your router to "hide" by not broadcasting its
SSID (your network name), this behavior is by design.
Is the name of your network also the name of the other network? (If the
name of your network is "home" you might consider a more unique name.)
If your SSID is unique and it is set to broadcast, then ...
Go to Network Connections, select your wireless network adapter,
right-click and chose Properties.
On the next screen, select the "Wireless Networks" tab.
You should see a list of "Preferred networks." "Remove" all of them
except yours. Click the "Advanced" button.
On the next screen, make sure that the box next to "Automatically
connect to non-preferred networks" is UNchecked. OK your way out.
Lem -- MS-MVP - Networking
To the moon and back with 2K words of RAM and 36K words of ROM.