Internet on laptop randomly disconnects?

Whenever I turn on my laptop (compaq, windows 7), it'll connect to my wireless internet. After a while of being on it, it'll randomly disconnect and tell me "no connects are available". The strange thing is that my iPad and iPhone works perfectly with the internet and never disconnects. Can anyone please tell me how to fix this?

Please try this: On right and side of your screen at the bottom right click on the network icon (Wi-Fi icon) the thing with 5 bars. Then press troubleshoot see if this works if not go to Wi-Fi settings forget the network and enter your security code in again.

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