Those of you who recently bought a Windows 7 PC can score Windows 8 for just $15, but you'll have to register by the end of the day Thursday.
To drum up interest in its latest OS, Microsoft cooked up a couple of upgrade deals last year.
The first one allowed any user of Windows 7, Vista, or XP to upgrade to Windows 8 for $40. That deal ended January 31.
The second one lets people who bought a Windows 7 PC between June 2 of last year and January 31 of this year get Windows 8 Pro for just $15. Though that deal expired last month, you can still register for it, but you'll have to act by this Thursday, February 28