My iPhone 4s won't backup to my computer?

Whenever I plug in my iPhone 4s to my Windows 8 Computer, it syncs just fine with iTunes, but I always get an error saying "iTunes could not back up your iPhone because an error occurred." It's never been backed up to this computer before, and I'd like to back it up in case something happens to my phone. Any suggestions?

You might have to restore because there's an error with the connection between your iPhone and iTunes.

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