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I have a Sony PCG-61315L. I go to network and it won't let me enable wireless no matter how many times I click to turn it on. The switch on the computer to turn on wifi is definitely switched on.
I once had the propblem that wifi only worked when i booted the computer with the wifi hardware switch off. Then i had to turn the hardware switch on when the system was up. Did you try that?
If the wireless is stuck as if disabled by hardware (it happens in some laptops when you use the wireless button a lot) and you cannot physically enable it, try in Terminal:
lspci
,iwconfig
andrfkill list
.