My iphone trust button isn't working?

I have a iPhone 4s with iOS 7.1.1 and when I try to sync it with my Windows 8 pc it asks me if I trust this computer. I click Continue in ITunes and then it says To allow access please respond to your IPhone. I try to click trust on my iPhone but it the notification doesn't disappear. I have tried resetting my pc and my iPhone and removing the USB charger but I still can't click Trust on my IPhone. It also doesn't work to click Don't Trust.

Well, maybe you just can't trust it. Sorry to say.

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