I bought upgrade from Windows 7 to Windows 7 Professional but it won't work

I have a new hp Pavilion dv7 which came with Windows 7 Home Premium.  I have found that my old xp devices won't work and was advised to buy the upgrade to Windows 7 Professional.  I bought an upgrade card at Staples and went through the installation steps

as per instructions.  It seemed to be okay.  I see the Windows Virtual PC folders listed in the Programs area of the Start Menu, but when I try to start them, all I get is a message that I have to install the upgrade for xp.  I don't know what these folders

are supposed to do, but they ain't doing it.  What can I do?  I'm not going to pay for ANOTHER upgrade when I already have one.

And why don't these things come with instructions anymore?????

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