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Before installing Linux Mint on your PC, run it in the live version to make sure everything works.
If it does, then click on the install icon and make sure your PC can handle it. Any computer should be able to use Mint.
As with any Linux, you'll need to give yourself a user name, give the PC name and set up a password. You can also set it up to automatically log you in or encrypt your home directory where your files will live. There wouldn't be any point in encrypting your files if anyone can get to them simply by turning the PC on so you can't choose both options.