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I usually use the Virtual PC .vhd from http://www.Microsoft.com/download/en/details.aspx?id=11575 together with Windows 7's Virtual PC to emulate an XP machine, so as to run any XP software or do software testing with Internet Explorer 7 or Internet Explorer 8 (for browser compatibility testing).

But often, I may want to keep the image and I can actually use an older serial number of Windows XP I had to activate it (or else the image may expire within a couple of months), but if I follow the method of activation here it will say the Windows XP is already activated and so there is no way to let the .vhd not expire. Is there a way to make it not expire?

(I often use the newest .vhd because those are the most updated images and also I don't need to waste 30 to 45 minutes installing Windows XP from a CD and then run all the SP2 and SP3 updates, especially if I need to do it at the work machine, and then at home on the desktop, and then on the notebook).

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