Installing Parallels-can't use my prior copy of Windows XP from Virtual PC?

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[quote vision63]I love paying for the same thing multiple times.
How so? When someone buys VPC with Windows, they are purchasing a license to use Windows on VPC. When they purchase an OEM PC bundled with Windows, they are purchasing a license to use Windows on that hardware.

If someone has purchase a license to use Windows on any one system, they could put it on VPC, the intel Mac, a toshiba laptop...