Let’s understand How To Find Out What Windows Version I Have first you eed to Verify the Windows version from the installation disk if your computer won't boot up. Click Repair your computer > Troubleshoot > Command Prompt after booting from a Windows USB or DVD. Press Enter after typing wmic os receive Caption, Version, and BuildNumber. Examine the device's version label or stickers to see if you can access the BIOS. These techniques aid in debugging and identifying workable recovery solutions.