Indicium is an Open Source, portable system information utility that can retrieve your hardware info and Windows product key.
Indicium is portable and comes with multiple themed colors from which to choose. Everything is broken down into categories with Summary, CPU's, RAM, Motherboards, Graphics, Storage, Network, Audio, Peripherals, and BIOS. You can click these categories on the left or scroll and expand in the main window.
If needed, there's a screenshot button to send your details to whoever needs it.
There's plenty of system information utility available on MajorGeeks, and Indicium hits most of the checkpoints that are of interest. It's small, fast, portable, and accurate. We'd like to see the ability to export to TXT or HTML, but otherwise a great little app.