Microsoft’s free upgrade offer depends on your PC’s hardware so it may not activate properly if you’ve swapped out hardware inside your PC. Installing Windows might sound like a daunting task but it's really quite easy, especially if you're installing a more recent operating system like Windows 10, Windows 8 or Windows 7. You can follow the question or vote as helpful, but you cannot reply to this thread. He's written about technology for nearly a decade and was a PCWorld columnist for two years. To reinstall Windows 10 after its free upgrade, you can choose to perform a clean install from a USB drive or with CD. Turn off secure boot. Select whether Windows 7 starts correctly or not on your computer, for information about how to resolve your issue. Windows 10 (Then select Download tool now.