My Macbook no longer sees other computers in my network

Hello,
I hope this question isn't too strange or difficult. This morning I booted up my Macbook to work on some grad school assignments in a different part of the house since my son was watching TV where my desktop computer is. All of my files are on my desktop, and up until today I have never had an issue connecting to my other computer to access them. Today was different. The "Network" icon does not show up when I open a new Finder window, and my other computer does not show up under "Places" in the Finder window. I have not done anything different, which is what baffles me. I have a wifi network at home which I am currently connected to.
Can anyone help me see other computers in my network again?

The "Network" icon does not show up when I open a new Finder window
Open up System Preferences/Internet & Wireless/Network - select Airport & put a check mark next to *"Show Airport status in menu bar."*
Right below the status box click on the "Assist Me" button and then the Diagnostic button. Follow the instructions.

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