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This article describes how to install Microsoft Windows XP Service Pack 1a (SP1a) on a computer that is running Virtual PC for Mac or Virtual PC for Windows.
Virtual PC has been tested with, and fully supports, Windows XP SP1a.
To download and install Windows XP SP1a, visit the following Microsoft Web site from the browser in the virtual machine (if you are using Virtual PC for Mac) or from the browser in the guest PC (if you are using Virtual PC for Windows):