itunes 11.1.1.11 freezes when I try to sync 4s and ipad Windows 8

I have recently update all my devices to os7 and now every time i connect any device (I phone 4s or Ipad 3rd gen) to my computer and try to change any setting itunes freezes and I have to force a shut down. Itunes acts normal until I connect a device and try to sync or make any changes. What would be the cause of this?