please please help!!! :`(

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http://androidforums.com – I got a nexus 7 as a gift a few days ago. It was working properly but yesterday the Google play app (the white shopping bag icon app) stopped working... as in, when I select the app to open, it says 'sorry Google play has stopped working'... I dont know what to do.... my Wi-Fi is strong and all other apps are working except this.... now I can't download anything at all - even from chrome.... can anyone please please tell me what to do.... Jenny (General)