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IF your question is how to Install ( not download) windows by flash memory so :
1- Try to convert your Windows CD or DVD to iso image by power iso software tool..
2- download and use this software tool " unetbootin-windows-584" to create a flash boot with Windows OS includeed ..and tray to start your machine with it ..
You can find your answer with more and better details here : http://www.wikihow.com/Install-Windows-from-a-USB-Flash-Drive
Good Luck
