how to install windows xp dual boot without cd rom, just usb iso?

IS777

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Jul 1, 2014
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I had pre-installed windows 7, and I want a dual boot with windows XP, but I dont have a cd rom in my computer, just a 16GB USB. How to install windows xp in a dual boot without a cd rom? please, I need a full detailed explication to make it. well, if its possible.
 

IS777

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Jul 1, 2014
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I dont know. This is my computer info:

CPU: intel atom processorN450 (1,666 hz,512 kb cache)
Memory: 1 GB RAM
Storage: 160 GB
IS ACER mark and has windows 7 ultimate installed.

I maked a shrink volume and got a 50 GB partition, but I dont know how to install win xp in that partition and use in boot. hope this info helps

I speak and understand spanish better, but if you dont know spanish, thats okay.
 

IS777

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Jul 1, 2014
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but this doesnt change the whole operating system. if its possible, I want both windows in one computer, if isnt possible, apologize me from asking. I want xp because is more faster than ultimate.