i can't boot linux os from a usb disk

so the issue is this, i downloaded an iso kali linux file so my intention was to boot the os off my usb stick, i used a iso to usb application to write the iso image into this usb stick and it was successful. the problem is that i can't get my pc to boot from this stick as it always tell me "starting windows" instead of something that has to do with debian or linux. in my bios my select boot device option doesn't include usb i can only see hdd, cd and network controller... i got to my boot options and set my usb to boot first before my cd rom and hdd but it won't boot the stick. i have a hp compaq nx6320 notebook running windows seven

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