I’ve read about this little Windows-only freebie and gave it a try: Free PC Audit. You just have to download it and run the executable (no installation required). It scans your PC and give you a clean overview of the hardware you have, the software installed and the processes that are actually running one the machine. It does a similar job than SiSoft Sandra Pro, but with a price of 0$, it’s worth a try. Don’t you think?