I want to install ubuntu on my PC which is running windows XP right now. I have made my pen drive bootable and have loaded Ubuntu on it. When I insert the pen drive at the time of booting of my PC, nothing happens and windows XP starts normally instead of asking me if I want to boot from my pen drive. Also when, I entered my BIOS setting to change the boot order there was no option of pen drive as a boot device.

Please suggest me a way to install the OS using my already made bootable pen drive. And there's no problem with my pen drive cause I have tried it on my friends PC and it worked normally.

Thanks in advance