Windows 10: Pre-installed windows that come with new laptop

I buy a new laptop that come with pre-installed window. I reset this with another windows by bootable pendrive, Now I want the previous version of windows that came with my new laptop.

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windows xp installation and dual core am

could someone please list the steps they follow to install windows with a dual core processor and windows xp service pack to. I'm reletively new to amd dual core and i feel i'm missing a step. All help will be appreciated. thanx

 

pre installed windows.

Hi my mates laptop a Toshiba Satellite L500-1DT won't boot into windows and I was going to reset it back to factory settings, when I set the laptop to boot from hard drive in the bios nothing happens and when windows tried to repair it I got the message ( Media test failure) but when I tried to put a fresh install of windows using my disc I got to the part where you wipe it and it showed three partitions one was SYSTEM and the other was Windows would the pre installed windows be in one of them if so how do I get to it, help, I think my mate had a muck about with it but he is not saying.

 

Acer laptop with windows 10 pre-installed

I purchased a laptop with windows 10 pre-installed and it has only two drives (e.g. C and D). I like to make it in 3 drives or partition. Please provide the steps for formatting without losing my original OS windows 10.