keylogger

can anybody how to make a keylogger through c/c++ which have follwing properties:-

1. I can be able to load at the start time automatically.

2. It should log the keys independent of the applications used eg it should log keys which r typed either in MS_WORD, notepad, emails ets.... wat i mean is it sholud log ALL KEYBOARD INTERRUPTS...

3. how to make it as a system file . is that i need to set using attrib command or sumthin else.

please help me design the code or if u hv one post it here.