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Microsoft’s Windows 8 and 9 will include a 128-bit architecture, according to a report on PC World’s Web site, which cited a leak from Microsoft's U.S. research and development (R&D) team.

Microsoft employee Robert Morgan appeared to describe the company’s plans for Windows 8 and Windows 9 on the LinkedIn professional networking site.

Morgan’s profile, in which he listed his position as 'senior research and development', says he works in “high security department for research and development involving strategic planning for medium and long-term projects.

The profile has since been removed from the primary LinkedIn Web site, but is still viewable in a Google search cache.

Morgan’s R&D projects include "128-bit architecture compatibility with the Windows 8 kernel and Windows 9 project plan" and is also responsible for creating “relationships with major partners: Intel, AMD, HP and IBM,” according to the profile.

Windows 7 is set to launch worldwide on October 22, and will be available in both 32-bit and 64-bit versions.

The option of a 64-bit version of Windows has been available since the launch of Windows XP Professional x64 Edition in May 2005

Vista, XP's successor, is also available in both 32-bit and 64-bit versions, but has failed to become widely popular.

64-bit computers can address more RAM and are theoretically more powerful than equivalent 32-bit machines.

The 64-bit versions are likely to become more popular with Windows 7, and a 128-bit version of Windows 8 would represent a significant step forward in performance.

Windows 8 would likely launch in 2012, assuming Microsoft keeps to its plans to release a new desktop version of Windows every three years.