My laptop isn't picking up Internet?

So my wireless is turned on, I'm currently connected to it on my iPhone, iPad and my sisters laptop. However, when my laptop searches for Internet, it shows neither my wireless, or my neighbors which is also discoverable by my phone (although locked). What can be the problem? I have Windows 7, it used to work and find the Wi-Fi, then in an attempt to put a password on my Wi-Fi, I'm guessing I must have changed the settings? Any help?

On the side of your laptop is there a wireless cut off switch? It will be a switch, green on red off, with a laptop logo and a wireless Signal coming off it. Thats on my Lenovo t420. If that does not work you can try looking through your computer settings till you find internet/wireless.

Um on the right hand side there should be a slidey button type thing near where you put cd's in, try that. I'm sorry i'm not a computer genius, whenever i lose Wi-Fi i press that.

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