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Low hard Disk Space
This is one of the most common reasons that might make a computer system run slower than it normally does. A near full hard drive will eventually fill up as you include more digital content like pictures or videos in it. The more filled it is the slower will a hard drive be.

Viruses
This goes without saying. Your system can be attacked by viruses if you haven’t installed any protection. Malicious viruses can sometimes inflict irreparable damage on a system. Most of them are designed to steal valuable info like credit card information. Unfortunately viruses also have a tendency to bog down your system.

Spyware
Like viruses, malicious spyware will also cause your system to run slow. This is software that installs itself into a computer and enables information to be leeched to another source without the user’s knowledge. Hackers also use spyware to access private information like passwords and a user’s internet history this way.