Why will my Iphone connect via USB on one computer and not another?

My IPhone 5s connected to my laptop and Itunes no problem, as soon as i did the ITunes update now neither my laptop or my ITunes will read my iphone via USB. I have no idea how to fix it.
(My laptop is Windows 8)
It can't be a cable issue because i charged my IPhone via my desktop and it connected no problem, it's something to do with this ITunes update i think.
Can someone suggest a fix please? I'm totally stuck!

could be your computer's firewall is preventing the proper installation of your CIT200.  try disabling and reinstalling the drivers again.
"Don't fix it if it ain't broken."

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