hey dude i can tell u how 2 install it using a usb device but have no idea how u can make ur usb bootable........
so 2 begin wid take ur win xp cd n copy d entire contents of it 2 ur pen drive....copy dem wid d same directory structure.....den restart ur comp...n use ne startup disk 2 cm 2 dos prompt...den in dos access ur pendrive n goto dat `i386` directory n use `winnt` to start ur installation.....
Hope dis helps...

