Holy cow, I wrote a book!
Some time ago, I gave
a scripting solution to the problem of obtaining the computer
manufacturer and model.
But what if you want to do this from C++?
I could translate the script into C++,
or I could just point you to
Creating a WMI Application Using C++
In particular, one of the
WMI C++ Sample Applications
does exactly what you want:
Example: Creating a WMI Application.
The only things you need to do are
SELECT * FROM Win32_Process
SELECT * FROM Win32_ComputerSystem