What do i do if my laptops Wi-Fi won't turn on though its not on airplane mode?

Okay so this laptop is a lenovo i5 thinkpad and i have been using it for quite a while now at varsity, but two weeks ago the Wi-Fi just went of and even when i'm in a Wi-Fi hotspot it doesn't show or try to turn on, please help me fix this because i got online tests and i have trouble using the university computers because the computer labs are usually full>>> Please Help!

J,
My name is James, I'm sorry your having this problem with your computer.

First, go onto: http://support.lenovo.com/...fault.page and browse to your computers driver page.

Download the latest Wi-Fi Driver and run the file.

Follow the installation process and after its done, you might need to restart your computer.

When its logged back in again, it should be working.

If these steps don't help, you should contact Lenovo and if your device is still under warranty, Lenovo should fix it for you.