Can't connect to wireless network on my laptop

I've got aspire one d257 - n57dqbb laptop and i've got a problem because I can't connect to my home wireless network but that's not only problem, I can't search for any wireless network, I can only connect to internet when I connect laptop to a router by cable, any idea what happened?

You should have a wireless network setup wizard in the Control Panel. Run it, then try the wireless search. If that doesn't help, Go to the Acer website and download the wireless driver for the operating system you're using.

Acer's "take the money and run" support requires you to verify that you are eligible for free phone support: "Enter your SNID (help locate) number. This is the 11-character value located next to the bar codes on the bottom of your product label. You may also enter your 22 character serial number."

install any external client like "connectify me" and make sure your laptop have installed wi-fi or any wireless driver