been trying to load windows 7 iso image on bootup from my dell inspiron laptop so i can install windows 7 but keeps saying disk error press any key to restart. I tried this on 2 laptops both dells and one is fairly new and one is older but both gave same error after i went into bios and put usb as first boot device. Since they both reported this it means they did go to usb as first device to boot but to test it i also put avira rescue iso which i have used before to boot pcs to recover from viruses and always booted before but now wont on the usb. Do i have to update bios or change another setting? Thanks.