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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 has been asked before and already has an answer. If those answers do not fully address your question, please ask a new 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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