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Possible Duplicate:
Installing Windows XP from USB pen drive
Persistent install of Windows 7 (or XP) on a USB stick
Can I run Windows XP from a USB flash drive?

How can I Install a fresh copy of Windows XP or windows 7 into USB flash drive or a USB external Hard disk & use it independently in any PC & Laptops???

Thank you

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marked as duplicate by Mokubai, Mehper C. Palavuzlar, Ƭᴇcʜιᴇ007, Daniel Beck, Not Kyle stop stalking me Jul 22 '12 at 17:16

This question was marked as an exact duplicate of an existing question.

It seems to work for some people, but this is by no means the intended use. If Windows detects that you are trying to install it onto a USB flash drive it will most likely prompt an error and abort.

However there seems to be possible according to this guide with a software called 'NT 6.x fast installer' and a little known video demonstrating its use. Again, this is not by no way intended and you might run into some peculiar bugs and errors.

Remember to take back-up when handling with formatting of drives and the best of luck!

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