According to various tech sites, approximately  35% of new computers downgrade to Windows XP from Windows Vista.

The downgrade occurs either at the factory or the buyer downgrades the system by himself or herself. The study is based on the past six months and on over 3,000 PCs.

Bill Lindner, a writer at infopackets.com notes that “it would be interesting to see a more thorough examination performed.”

The downgrade option is available to those who purchase a Windows Vista Business and Vista Ultimate operating system as well as Vista Enterprise OS.

Source: Infopackets