This is the concept of Live CD. Booting your computer from the cd/dvd drive instead of internal disk drive enable user to test drive the operating system without actually installing it permanently. Today we can do the same thing with a USB stick.
Is your computer old, sluggish, tired, or just not working as well as it once did? Does the box and monitor look perfectly fine?
Don’t change the computer, change the software that runs on it. There is a huge assortment of free and open source software that will bring new life to that tired old computer.
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