Mark's computer has had the upgrade icon appear for Windows 10, but he doesn't want to be a beta tester. Leo says that message is the Microsoft reservation icon for upgrading to Windows 10. They've been doling them out randomly to Windows 7 and Windows 8 users who have compatible hardware. He can reserve it, and when it's ready, it will automatically download and upgrade it. But not before he says "yes" a final time. What if he wants to cancel his reservation? Leo says there's a knowledge base article here (KB3035583) that will show him how to uninstall the Windows 10 upgrade offer.