BartPE is a third-party tool which allows a mini-version of Windows XP to be run from CD/DVD disc without installation on internal HDD. BartPE builder is a freeware and it can be downloaded from here.
FlashBoot can convert ISO file produced by BartPE builder into bootable USB storage device.
1) Run FlashBoot Pro, click Next
2) Choose "Full OS -> USB" in the the Main Menu
3) Choose "BartPE (mini version of Windows XP)" in this menu and click Next
4) Specify BartPE builder output ISO image file (or CD disc) and click Next
5) Specify target USB storage device and click Next
6) If necessary, change volume label, or leave it as is, and click Next
7) Check summary information and click Format Now
8) Wait for process completion
9) Bootable USB storage device is ready to use. Click OK to exit
Please Note: BartPE will not boot from USB if size of source ISO image file is larger than 500 Mb
