Windows xp on external hard drive

hi
i`m running windows 7 but want to install windows xp on my external hard drive, to use as a portable windows. i tried booting from disk and installing but after copying file it gives me a blue screen error. the second thing i tried was openning "run" and putting in the following comman: "E:\\I386\\winnt32.exe /syspart:D: /tempdrive:D: /makelocalsource /noreboot\"
this basically tell it to install windows onto drive F from cd-rom BUT this didn`t work it gave me a message saying the operating system on this computer is not authorized as the it has a later operating system......plzzz help
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More about windows external hard drive
  1. Do you have Win 7 Professional? If so, you can install Virtual computer "XP Mode" without any problems.
  2. Do you have Win 7 Professional or Ultimate? If so, you can install Virtual computer "XP Mode" without any problems.
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