MacBook Pro no longer seeing wifi

My MacBook Pro suddenly can't see my home network. I have Ethernet at work and it has been switching to my wifi when I get home.
Now suddenly it says there is no wifi installed. If I hard wire to the router, all it can see is my work Ethernet details.
What's gone wrong do you think, it was working perfectly fine, until I need to work from home!
I haven't installed any updates. The system is lion (sadly).
If I click on the wifi symbol in the top menu bar it says 'no wifi hardware installed'
Can anyone help?

You need to go to the HP Printer Support web site and download the newest Lion-compatible printer drivers for your model of printer, and install them.
Hope this helps

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