I recently upgraded iTunes to 11.1.4.62 and then itunes would no longer recognize my iphone 4s and iPod

I recently upgraded iTunes to 11.1.4.62 and then itunes would no longer recognize my iphone 4s and iPod although I can see the iphone but NOT the iPod on the computer (windows 8.1 Pro).  I checked everything , cable, services, stop and start and automatice, etc.and went through all the steps on the apple support site, to include removing all apple software in the designated order and reinstalling it.  iTunes still doesn't see the iphone.
The Apple iPhone shows up only under protable Devices in the Device Manager window and has a Yellow ! warning triangle, and there is no Apple USB controller in the devices menu.under Universal Serial Bus Controllers. When I look under the properties of the Apple iphone, it says in Device Status, to reinstall the drivers for this device (Code 18).
When I do this,  I get the following: "Windows found driver softweare for you device but encountered an error when attempting to install it" Apple Mobile Device Driver One of the installers for th this device cannot perform the installation at this time. I tried both suggested locations on the C: drive.
Also I can't seem to find out how to install the Apple USB Contoller or is that related to the problem above?
The iphone and my ipod work fine with this version of itunes on Windows 7 on my laptop.  is it possible that I am missing a critical update from Microsoft on the driver and USB controller?  I have been leery of installing them since my computer had problems with some updates in January.
I 've tried every thing listed in this forum, I think, and the Apple support page on this subject.  Please help!

Version 11.1.5.5 of iTunes was just released today. If you update to that, does that help with the recognition troubles?
http://www.apple.com/itunes/download/

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