Illegal copies of Windows 7 are already available in Chinese street markets, months before the operating system is due for release.
A Beijing market stall is one of many offering a hard drive image of the operating system saved on to a DVD disc for 40 yuan or $5.86, according to Computer World.
The benefit of hard drive images, or ghost files, is that software can be transferred on to a system, without having to make any product activations or authenticity checks.
The owner of the stall told Computer World that she had been selling these versions for over a month and had sold them to several dozen customers.
Further investigation of the disc found links to a website riddled with malware.
In Shanghai, police had cracked down on software piracy ahead of the World Expo. However, much of it was still available off the beaten track.