Hi,
That are 2 flavors of linux (URL's for both:
ubuntu_ultimate_1.3 and
linuxMCE).
If the iso's are already on a cd/dvd (each on his own) you are probably able to boot from them. After booting there will probably be an option to put it on your hd (I know Ubuntu iso's do, not sure about linuxMCE).
Hope this helps.