Precautions that must be taken in order to secure computer files

to secure computer files include:
A firewall helps to
prevent data from entering or leaving your computer without your permission. It
helps make you invisible on the Internet and blocks communications from
unauthorized sources.
There are two types of firewalls—software and
Updated Anti-virus Programs: 
software helps to protect your computer from viruses that can destroy your
data, slow your computer’s performance, or cause your computer to crash.
Anti-virus software scans your computer for patterns that may indicate an
infection. The patterns it looks for are based on the signatures, or
definitions, of known viruses.

Back up all your Data:
There are many hardware and software alternatives for backing up your data
including USB flash drives and external hard drives (hardware) as well as
archiving and disk imaging programs (software).
Encrypt files on your computer: Encryption is a way to enhance the security of a
file or folder by scrambling the contents so that it can be read only by
someone who has the appropriate encryption key to unscramble it.
Disable file sharing. Make
sure that file sharing is disabled on your computer to ensure that intruders
cannot access your private files through the network. With file sharing
enabled, it’s possible for unauthorized individuals to access your files.
Install Protective Software: When installed, the software should be set to scan
your files and update your virus definitions on a regular basis.
Choose Strong Passwords: Choose strong

with letters, numbers, and special characters to create a mental image or an
acronym that is easy for you to remember. Create a different password for each
important account, and change passwords regularly.
Control Access to Your Machine: Don’t leave your computer in an unsecured area, or
unattended and logged on, especially in public places.
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