I am trying to reinstall Ubuntu on a partition on a dual boot pc - win 7 and Ubuntu. There's something wrong with the Ubuntu and it's time to reinstall. So I downloaded the 780 MB iso and moved it to a flash drive. I tried booting to it by F12 and
1) I don't know which of the five usb choices to choose from usb-fdd, usb-zip, usb-cdrom, usb-hdd. I tried the -hdd and it just boots Ubuntu.
2) I don't know how to make the iso on the thumb drive to start installing.
Any help is appreciated! Thank you,