First of all, you need three things:
1)A USB Drive you are willing to sacrifice(2 GB or higher is preferred)
2)A computer running XP, Vista or 7.
3)A distribution to run Live or install on the USB drive.
Where to get the requirments:
USB Drive: I got mine at WalMart
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Step 1: Getting Set Up.
DISCLAIMER:I am not responsible for any harm to your existing OS. Use with Caution!
Download the software:
This will allow you to choose a distro.
For example, Slax
Make sure you don't use a installer if you want to use a LiveUSB.
By the way, Slax has persistent memory, meaning things will stay inbetween boots.
Step 2: Now, for the Work
1)Plug in your sacrificed flash drive.
2)Make sure NOTHING you want is on it.
4)Open the App.
6)Tick the box that says "download the iso"
7)When the popup comes up, hit "yes"
8)Select drive. Make sure you tick the flash drive.
10)Let it run.
11)Wait for it to complete.
12)Done? Turn off computer.
13)Turn it back on and open up the "boot deice menu.
14)Use arrows and enter to select USB Device.
15)Hit enter if using Slax.
16)Watch the magic happen!
Step 3: Done!
Hopefully, after this, it will work. If not, ask me, I may be able to help.