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Upgrade the computer's hardware components
If your desktop computer or laptop is running slow and you've been using it for a long time (e.g. over 2 years), consider upgrading its hardware components, such as the CPU (Processor), RAM, Hard disk drive, etc, provided that your computer will support the new ones (feel free to consult the manufacturer's website for more information on the specifications).
If you are using weak hardware components, it will be almost impossible to browse the net with a good speed, watch a movie and install new programs, etc., because developers create new websites and programs which consume more memory and which can work properly only on computers that have the latest or not-too-old hardware components installed.