How to install xp with pen drive?

You need to boot using your pendrive. For that, your motherboard should support external USB storage device as a boot device. Check BIOS.

THere is a specific version of XP for USB booting adn automated installation via the usb, google for the same..

i have no cd rom in my laptop how i install win xp by using pen drive

yeah-in fact i have downloaded many usb versions of xp--but none of them boots

Search for
liveusb-creator
or
pebuilder

they a good....

*www.eeeguides.com/2007/11/installing-windows-xp-from-usb-thumb.html