My laptop has many viruses

Hello guys, I am a freelancer as well as the student. I use to provide content writing. So I want to share one of my problematic situations actually nowadays when I am using my laptop it is not working properly it started to work at a slow speed. I asked many people about this problem and they all told that there are viruses in your system and you need to purchase an anti-virus. So I bought a premium antivirus which was good enough but did not work on my laptop. After using that antivirus my laptop started to work more slowly. Guys, seriously I am worrying about this problem. And I just want to make my system perfect I don’t want to face any difficulty while doing my professional work. if you have any idea to help me please guys share your tips by which I can solve this problem.

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