[ubuntu] ubuntu usb boot error please help

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http://ubuntuforums.org – (I'm using a Phenoix BIOS on a 32 bit dell inspiron 530) well my os has failed im using windows vista on a dell inspiron 530 hdd,im trying to boot ubuntu from a usb stick but when i do it just tells me boot error?? my bios boot priority is set to removable then hard disk then cd rom and my removable device priority is set too - USB-ZIP0 : Make of USB 1GB can anyone please help,should i change my bios settings? or should i just try with a cd btw is their any other way besides using ubuntu that i can retrieve my date from my hdd(windows vista) and safe mode is not an option as (Hardware)