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#31
This can help you download your choice of Linux LinuxLive USB Creator and make bootable USB drive.
I that rectangle you would see many kinds of Linux. I'd suggest ZorinOS which is very similar to Windows and easy to use.
So just insert an USB stick, chose that Linux and let program make BOOT drive. Then you BOOT with it and use any way you want without a risk to other drives and files.
If you want, you can do it on a small, cheap USB drive as it can be useful for many things later on.