:Go to Start > Settings > Update & Security > Activation . Windows 10 and 11 have built-in troubleshooters that replace the old standalone tools.
:If you're facing persistent "non-genuine" notifications, some experts suggest clearing the Software Protection Platform cache by deleting the Tokens.dat file (backup first!). Summary Table: Tools by OS Version Operating System Recommended Diagnostic Tool Windows XP / Vista / 7 MGADiag.exe (Legacy) Windows 8 / 8.1 Licensingdiag.exe Windows 10 / 11 Activation Troubleshooter (Settings) Microsoft Genuine Advantage Diagnostics Tool
:If you actually are on Windows 7 or older, ensure you are running the tool with full administrative privileges.
If you’re running the and hit the "Validation Unsupported OS" error, it usually means you’re trying to use an outdated tool on a modern operating system.