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For example, if you use a Windows Operating System, the updates are a way to protect your computer from any security loopholes that may have been discovered since you installed Windows.
Set your computer to check for updates automatically, ensuring you are well protected .
In the absence of a firewall, malicious users may attempt to break into your system while you are online.
A good anti virus software will protect your computer from all sorts of security threats including but not limited to virus attacks and spyware which could otherwise cripple your computer.