Message 'Wi-Fi: No hardware installed

MacBook late 2008  2 GHz Intel Core 2 Duo   OSX 10.9.2
Hi,
Some advice please re. the above situation.
I was working on my MacBook when the screen froze. I can’t remember the last time this happened. Pressing and releasing the power button to shut down did not work, so I pressed it continuously until MB did shut down.
After starting it again, I was surprised to see the Wi-Fi symbol at the top of the screen was not showing its bars as usual; in their place was a white cross. When pressed, the message ‘Wi-Fi: No hardware installed’ was revealed.
When I go to About this Mac : System Report : Wi-Fi, I see this:-
  Software Versions:
  CoreWLAN:     4.3.2 (432.47)
  CoreWLANKit:     3.3.2 (332.36)
  Menu Extra:     9.3.2 (932.35)
  System Information:     9.0 (900.8)
  IO80211 Family:     6.3 (630.35)
  Diagnostics:     3.0 (300.40)
  AirPort Utility:     6.3.2 (632.3)
When I go to  System Preferences : Network, it says ‘Wi-Fi Off”.
Strangely, I did successfully get online via Safari on the MB but only once. Now, there is no internet access from the MB.
I can access internet with iPhone and iPad whose settings properly show the correct home Wi-Fi name, and I can use iTunes to pass docs from and to them when they are USB connected and just by Bluetooth.
Earlier that day, I had received a warning from a friend that his email account had been hacked. Later, whilst checking Spam folder (Yahoo), I inadvertently clicked an email from him, saw that it was indeed Spam, and quickly closed it again.
Could this have contained something that caused the above situation?
Any advice as to why this has happened and its implications, please? And how to get back to normal?
Many thanks,
Graham

I had the issue after upgrading from 10.7.3 to 10.7.4. It has persisted into Mountain Lion. Recently, my late 2011 15" MBP had its wifi card and cable replaced, along with the main logic board. The logic board was damaged by the repair staff in the process of disconnecting the wifi cable. A couple of days ago, my wifi started shutting off randomly but would return after a restart. Now I've got the "no wifi hardware installed" message again. I haven't checked System Profiler to see if the wifi card is listed. Previously when I had this message, it was not. So, yes, the hardware repair fixed the problem for about a month. And now it's back.

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