Installing more than one program to constantly scan and monitor your PC for viruses and other security threats can create problems, because the two applications will likely interfere with each other’s work. Clashing antivirus programs can cause the computer to behave erratically and run more slowly as the applications battle for system resources.

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Before you start, make a list of your computer’s current components — like its hard drive type and capacity, the amount of memory installed and other system details — so you know what you’re starting with and to ensure any upgraded parts will be compatible. Your machine’s manual or system information box should have the configuration. You should also fully back up the data on your hard drive before tinkering around under the hood.

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