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How to install windows xp on a windows vista computer
Consider if you really want to downgrade.
The most problematic issues with windows vista only apply to the original 2006 version of vista, not the newer sp1 version that comes with computers sold today. Windows 7 also doesn't have these issues.
Windows vista (7) also includes many features that enhance productivity, including instant desktop search, and features improvements in security. Back up the files you want to save.