Excellent and thanks for the "spot on" tip! I only wish I had found it before bringing up a different compter to re-sync my Apple mobile products, which of course meant I had to rebuild my libraries on that system. 😟
On Windows 8.1 64 bit I did find the steps to be a little different from what Steven outlined and for those less compfortable with technology I thought I would include a version edited for Windows 8.1 64 bit specifically.
Connect You Apple Mobile device to the PC with iTunes.
In the PC's Device Manager expand the "Portable Devices" entry.
Right-click the Apple iPhone, Apple iPad, or Apple iPod entry in Device Manager and choose "Update Driver Software" from the shortcut menu.
Choose the option to "Browse my computer for driver software" and browse to: C:\Program Files\Common Files\Apple\Mobile Device Support\Drivers and highlight that folder for the driver update.
Click "OK" then "Next" and your Apple mobile device should now be rocognized (verify this in iTunes)
Repeat for any other Apple mobile dvices synced on this computer.
All credit to Steven, however!