take your windows xp in pen drive,external hard drive,usb devices ,pda anywhere u want with this guide .so that u can use it any any operating system be it linux,man ,windows ,ubuntu etc. through usb

All that's needed is a bootable USB Flash drive with at least 256 MB of storage capacity and a Windows Setup CD. Using the program Bart PE Builder (Freeware), you can install Windows XP on the flash drive, along with other software as needed (and as available space permits).