bootable USB. for that u need to do some things in the BIOS settings. In the BIOS there will be a option named Legacy USB support. and USB boot. U should make it enabled and save the settings.
If u want To create a bootable USB to boot linux, U can easily make it using the Linux CD/DVD.
For windows
http://www.webtree.ca/windowsxp/crea...dvd_or_usb.htm
http://www.pcstats.com/articleview.c...id=1676&page=2
http://www.bootdisk.com/pendrive.htm