First of all, you should go to the BIOS settings, and Ensure that the wifi adapter is enabled on your pc. if it is not enabled, you may enable it. now go to the device manager and check the presence of wireless adapter.
Probably, you don’t have a wireless adapter on your pc, if you have any, than it must not be latest one. that’s why your pc is not detecting the wireless connection. so you should remove the wireless driver from your pc, and install a new driver, for more assistance, you can visit: [http://askprob.com/asus-laptop-wifi-is-not-working/|how to fix asus laptop wifi not working problem]