If you're only trying to get a linux terminal to mess around/learn with just do as the others posted above.
Just download virtualbox, it's free:
http://download.virtualbox.org/virtu...-82870-Win.exe
With that ^ you can create little "virtual machines" that are imaginary computers inside of your real physical computer.
Create a new virtual machine and install a linux distribution onto it
If you were installing Ubuntu onto a real physical computer, you'd download this
http://www.ubuntu.com/start-download...release=latest and burn it to a CD and then boot from that CD.
In Virtual Box you just tell the fake CD drive in the fake computer that the .ISO file is the CD inside and go from there like you would on a real computer.
Hope this helps