System monitoring tools are aplenty when it comes to a PC. You might have used HWiNFO, MSI Afterburner, HWMonitor, CPU-Z, GPU-Z, or other tools at least once. Many users, however, ignore some of the most useful tools on Windows that can not only monitor your PC components, but also diagnose stability and optimization issues. Some of these are built-in Windows tools, while others are great third-party utilities to always keep on your PC.