Poor Wi-Fi signal tablet netbook?

My 7" Android Tablet Netbook gets signal but then it says not in range no matter how close I'm to the router. I'm getting Wi-Fi on all my other devices including an iPhone 3GS. I actually haven't let it charge for a full 4 hours, but it says its charged. Should I let it charge the ful 4 hours and let it charge, then try setting my Wi-Fi back up to it, or could it be a technical problem? Need feedback!

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