Hi
Create a boot disk for Ubuntu and use it to boot the computer into Linux...
You can do this on any computer.
Follow the instructions to Create the Boot Disk using some program that will write it to a CD, or DVD and use it to boot your computer.
Don't choose to install it when you are offered the option, just let it boot to Ubuntu.
Turn a mild-mannered ISO file into a spinning optical Frisbee.
Ubuntu will have a file manager, browser, etc., completely independent of Windows.
You're done by using the file manager to copy the files to a USB Drive.
It's handy to have an Ubuntu disk around, it will boot almost any Windows computer when it won't start, unless it's a mechanical issue.