Why won't my iPhone 4S show in iTunes?

I recently got a new computer and it has Windows 8 on it and I wanted to sync my iPhone but it won't load in iTunes. I've tried numerous things like updating both iPhone and iTunes (both up to date) and re-installing iTunes. ITunes and iPhone aren't blocked or anything on the computer and my iPhone comes up and charges but won't show in iTunes. When I plug my iPhone into my computer it comes up with a window saying 'Tap to choose what happens to this device' but it doesn't show anything like 'load in itunes' or something. Any help is much appreciated.

Try connecting it to different USB port.

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