Back up important files
No system is completely secure. If you have important files stored on your computer copy them onto a removable disc, and store them in a secure place in a different building than your computer.
If a different location isn't practical, consider encryption software. Encryption software scrambles a message or a file in a way that can be reversed only with a specific password.
Also, make sure you keep your original software start-up disks handy and accessible for use in the event of a system crash.
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