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I have a small laptop with Windows 7 64-bit installed (no CD ROM drive). I have the installation files of Windows XP on a USB flash drive but it's not bootable. I want to remove Windows 7 completely and install XP.

When I simply run the setup file in USB, the "Install Windows XP" choice is not selectable and there's no explaination. I found some programs which can prepare a XP bootable disk on USB, but those programs won't run on 64-bit system either. Do I have any way ?

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Please can you mention the exact configuration of your laptop and the brand, so I can help you quickly with a solution. – aliasgar May 30 '13 at 8:03
    
" I found some programs which can prepare a XP bootable disk on USB, but those programs won't run on 64-bit system either." - Which programs were these? WinToFlash, Rufus and many more work fine on Win7 x64 and support transferring XP ISOs to USB. – Karan May 31 '13 at 1:39

Did you try Linux/Ubuntu tools. You might start with How to create a bootable USB stick on Windows. It might be necessary that you download and provide a 32bit Ubuntu ISO to create the stick, but it should be bootable. You could then try to exchange the ubuntu files with your XP files. Once the stick has a proper boot sector, it should be fine. It should format as FAT32.

A second, maybe even better, option might be given at How to boot from a USB device?.

Good luck.

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