Hi,
Here are some troubleshooting steps that may help in solving that issue.
- Start by toggling fn+F3 to enable and disable Wireless connection of your laptop and see if you'll get the connection back.
- If it doesn't work do try to uninstall/reinstall the wireless adapter driver.
- Go to Device Manager and uninstall the wifi adapter.
- Once uninstalled reboot your laptop and it should reinstall the driver automatically.
- After the reboot do test it again if you'll have the connection.
- If all these will not work, do run System Restore and restore it back to an earlier date or time before the problem even happened.
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http/windows.microsoft.com/en-PH/windows-8/restore-refresh-reset-pc