Windows print screen when using Boot Camp

Solution 1:

Follow these instructions in order to map the F13-F15 keys on an Apple keyboard to the functions, Print Screen, Scroll Lock, and Break commonly found on PC keyboards:

1. On your PC, copy the following lines into a text file.

REGEDIT4 [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Keyboard Layout] "Scancode Map"=hex:00,00,00,00,00,00,00,00,04,00,00,00,46,E0,5F,00,46,00,5E,00,37,E0,5D,00,00,00,00,00

1. Rename the text file remap.reg
2. Double click on the file remap.reg and answer yes to the question about adding the information to the registry
3. Reboot

Function keys are now remapped to their PC equivalents

Source: MacWindows.com

Solution 2:

This article at Apple's KB includes the mapping of Windows keys to each of their keyboards.