Why does my Wi-Fi keep going out?

I have a Netgear as my Wi-Fi and i have a window 7 toshiba computer i think the problem is coming from the laptop because my iphones and andriods and everything else tht uses Wi-Fi works. But my laptop works for a certain length of time and the Wi-Fi will just cut off in the middle of doing something, it first has a yellow trigangle and it said no network found. Is there any suggestions on fixing this or anyone know how to fix it. Oh and also when i press it sometimes says limited access.

Your Internet connection is not connected to the Internet well you probably need to contact assistance for your Internet/& or computer

Dear you can enjoy your connection Wi-Fi, please check you connection settings, i think it is due to your connection modem problem.

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