The issue seems to be with Boot Camp drivers 3.1 and up which affects Apple hardware running Windows via BootCamp.
The solution that worked from me was found in this thread on the Apple Discussion forum posted by nallex:
Open "Control Panel" from the Start Menu
Select "Clock, Language, and Region"
Select "Change keyboards or other input methods"
Click "Change keyboards..." button
Click "Add..." button
Roll down "English (United States)" (if it's not already expanded)
Select "US"
Click "OK"
Click "OK"
Click "OK"
Hopefully Apple comes out with BootCamp drivers to fix this issue.
