I find that the caps lock key is useless for me and it only hinders typing when accidentally pressed. It can be disabled on Windows by adding a registry entry.
Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Keyboard Layout] "Scancode Map"=hex:00,00,00,00,00,00,00,00,02,00,00,00,00,00,3a,00,00,00,00,00
This creates a new registry entry
Double-click the file to add this registry entry and its value. It will ask for Administrator permissions.
Restart Windows. Your caps lock key should be disabled now.
To enable the caps lock back, open the Registry Editor, delete the above entry and restart Windows.
Tried with: Windows 7 Professional 64-bit