My Iphone 4s won't restore to factory settings?

My iPhone 4s had been stuck in a continuous reboot loop and the started showing the "apple screen of death." I Held the sleep/wake button until it restarted and continued to hold the home button until it showed the connect to itunes screen. I connected to itunes and it says it must be restored to factory settings. I accepted and then before it even begins to restore a pop up says that it can't be restored because of unknown errror (-39). I have the latest version of itunes. I also have a Windows computer. I don't know what to do at this point.

Buy an iPhone 6

I had a similar problem. The best thing to do is go to your carrier and replace your phone.

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