Regarding the configuration of my system, I have:
Intel core(TM)2 Quad CPU 2.4GHz
RAM: 8.00 GB
Hard: 160 GB I have 50GB for my linux.
First, I want to learn to remove linux completely.
Second, I want to know how to install a new version of linux when I do not need my previous data and I want to remove them all. (because by installing the new version the previous data is not removed.)