How to get Windows system information?

[dpickles at pacbell.net]

Does anybody know how to get the:

     Free hard disk space
     Amount of CPU load
     and Amount of RAM used

on windows? I am making an artificial intelligence program that has
"moods" based on how much stress the system is under, based on these
parameters. I think it could possibly be done via COM. I am not looking
for a cross-platform solution- just something that will work on
Windows. Thank you for your help!