Running too many programs in the background. Then you run out of memory. (RAM) A simple memory hardware upgrade usually handles this.
Or, more seriously ---
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Computer viruses --- Which are programs written to do harm to your computer that are intended to cause you major headaches. Keep your anti-virus program up to date!
Adware – These were originally designed as marketing tools to track where you go and what you buy on the internet for marketing purposes. Unfortunately this has gotten way out of hand.
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Spyware --- Programs designed to spy on you.
All of the above running separately or worse at the same time can and does use too much computer resources and will affect the reliability of your computer.
If you need help with this or other computer related problems please call me.
Sincerely,