I got a nasty virus on my laptop, (Dell Ispiron 910 / Mini). I tried various anti-virus programs with no success. I need to reformat using a USB drive, as I have no CD drive on my computer, so I want to reformat with an .iso file on a USB drive. I've tried to search for how to reformat using a USB drive and ISO file, but couldn't find out how. If anyone could explain how, it would be greatly appreciated.