you can disable certain special keys like Capslock Key and Windows key ,etc by editing windows registry.
for more flexibility .. look over these links
*ask-leo.com/how_can_i_disable_my_windows_key_or_for_that_matter_remap_my_entire_keyboard.html
*www.winappslist.com/utilities/keyboard.htm
*softboy.net/key/
-----
alibi