Can't see local network

I have 3 computers networked together. One is plugged directly into the router, the other two use wireless cards to connect. The computer I use most is one with a wireless connection. Sometimes my computer doesn't see my network. I know the router card works, because at those times I can see other wireless networks in my neighborhood, I just can't see the one in my own house. During those times my son's computer, which is about 3 feet away, sees and connects to the local network just fine, so I know the router is working. When I can see my local network, the signal is strong, so I don't think it has anything to do with signal strength. I'm stumped. When the problem occurs I've tried rebooting my computer, but that doesn't make a difference.

Hi…….
          Well in this case what you do is from your hardwired PC log into the setup page of the router with http://192.168.1.1 username leave blank and the password is admin.
Under the wireless tab change the channel to 11. And under advanced wireless settings lower the Beacon to 75 > Fragmentation Threshold to 2304 and the RTS Threshold to 2307. And then you can check the connection with your wireless PC
   Also try to reinstall the wireless card in your Pc once.

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