Do NOT start more than ONE thread about particular problems here!
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Do a System Restore to a date before you had this problem:
"How to Do a System Restore in Windows 8 and 8.1"
http://www.eightforums.com/tutorials/4692-system-restore-how-do-windows-8-a.html
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Make sure that you have downloaded and installed the latest Wi-Fi Drivers for your Model Laptop and Operating System from the Laptop manufacturer's website.
Go to their website > Drivers/software/Support Downloads Section > key in your Model Number and Operating System > download and install the Wi-Fi Drivers for your operating system.
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Also read the Manual for your Model which you should be able to download there, too.
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"How do I fix network adapter problems?"
http://windows.microsoft.com/en-au/windows/fix-network-adapter-problems#1TC=windows-8
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And some Laptops have a physical switch to turn on Wi-fi.
http://www.computerhope.com/issues/ch001410.htm
Read under these different headers at the above link:
- Enable with laptop Wi-Fi button
- Enable with laptop Fn and Function key
- Enable in Windows
Note: In Windows 8, when you right-click the Wi-Fi icon, check to see if Airplane Mode is turned on. If it is, turn it off to enable the wireless network card.
- Enable in Windows Device Manager.
- Enable in CMOS setup