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Hi Wbm,
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I suggest you try the following.
Menu > Settings > Apps > All > Google Play Store > Clear Data.
Once done try using the App,
Let us know how you get on.
You could boot on safe mode and see if it works
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008