Change Windows Key shortcuts on Windows 8
Download SharpKeys (also can be found here) and remap a less frequently used key to Win. On an older machine with an otherwise fantastic 101-key PS/2 keyboard (that's 15 years old and going strong!), I used the right Alt key for this purpose, but the choice is yours. Be careful however and don't remap any important keys!
Edit: Similar apps, but personally I've been using SharpKeys for ages over multiple Windows versions, and it just works.
You should be able to edit the Scancode Mapping in the registry.
Warning: Extremely difficult.
The scancode for the Windows key is E0 5B.
You can use this utility to generate the registry key.
Make your Caps Lock key trigger the Windows Logo key instead.
- save as caps.reg:
Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Keyboard Layout] "Scancode Map"=hex:00,00,00,00,00,00,00,00,02,00,00,00,5c,e0,3a,00,00,00,00,00
double click to import into registry
reboot
from: http://mattshaw.org/news/window-map-caps-lock-to-windows-key/