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What steps must you take to dual-boot Windows 7 and Windows XP when you have Windows 7 installed first?

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See this article : Install Windows XP in Dual Boot with Pre-Installed Windows 7.

It explains in much detail and with many screenshots how to install XP after Win7.

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Dualboot pro is not free software. I cannot use this method. – Chris Nov 19 '09 at 1:57
You may be able to do the same with EasyBCD at – harrymc Nov 19 '09 at 8:57

If I remember correctly, you'll need to install Win XP, then use the Win7 install disk to load up the recovery environment and rebuild the MBR. I would see if you can run x86 XP in XP Mode, it would be easier.

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You don't need dual boot you can run Windows XP Applications in XP Mode. MS uses Virtualization to achieve this.
Details here

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My main problem is that I have 64 bit win7 installed and an application I need does not run on 64 bit Windows. So I planned on installing my old XP back as a dualboot :) – Chris Nov 18 '09 at 4:52
PS did you mean virtualization, rather than visualization? Would this not be slower to run memory-intensive apps? :) – Chris Nov 18 '09 at 4:54
yes, corrected it, I meant virtualization. It will be slightly slow. But it will not make a big diff since this is done in the background by MS, I have run many apps on proper VM on Virtual Server, depending on the RAM you allocate to it, it works well. – Binoj Antony Nov 18 '09 at 7:50

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