Blogger Colin Nederkoorn started the competition by putting up $100 of his own money as a prize.
"My new Apple MacBook shipped on 22 February. I told my boss that this would replace my IBM desktop and I could boot Windows XP on it. I am still confident it can be done," Nederkoorn's website said.
According to a short message on Winxponmac.com, the " contest has been won - updates to follow shortly".
The competition winners, who go by the usernames 'narf2006' and 'blanka', provided a video showing how to make the system run Windows XP.
As well as offering his own money, Nederkoorn also accepted donations from anyone who wanted the instructions on how to dual boot the two operating systems. The total prize was $13,854.
The competition had strict rules, including that the Mac must boot Windows XP rather than any other version of Windows, the two operating systems had to co-exist on the machine, and users must be able to choose which OS to boot up when the computer is started.
However, hardcore PC gamers hoping to migrate to a Mac system will be disappointed. "There is no chance you could play a game using this solution," Nederkoorn said in his blog.
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