Wifi might be 'on' but make sure you are connected to a network.
If you are then make sure that any other wireless devices can connect to the internet first.
If they can then on your laptop do the following:
Hold the windows button on your laptop (it looks like a flag) and press 'R'.
This will open a black command prompt window. Inside this type the following:
ping
www.google.com
and press enter
If the result shows it receives 4 responses then you have an issue with Internet Explorer and I would download Firefox browser onto another computer, save it to a memory stick and install it on your laptop.
If the result shows no response then you have some kind of networking issue. Try plugging in a network cable from the back of your router into your laptop and try again. If that works then you will need to try reinstalling the wireless drivers, if it doesn't, then I would reinstall Windows.
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