Thinking of a PC as a 'Windows machine' is typological. It's quick and easy to install one of the excellent Linux distributions on almost any PC, wiping Windows in the process. Think of it as replacing the entire genome in a cell, but keeping all the cytoarchitecture. The result is a faster-metabolising, more resource-efficient cell with superior immunity to virus attack and no need for intragenomic shuffling (hard drive defragmentation).