Beware that Total AV virus protection is a scam

The likelihood that you have any viruses on your Mac is pretty close to 0% as there are currently no know Mac viruses in the wild (last I checked). What is more likely is that the AV software you downloaded mistook normal, benign files as viruses. There are other types of malware that can cause problems.

You don't need AV software on a Mac. While you have have some malware on your computer, it's not the first thing I'd consider if the computer was running slowly. To start, I'd look at Activity Monitor and see what's going on. AV software itself is notorious for slowing down Macs.

Effective defenses against malware and other threats

For more in depth diagnoses, use Etrecheck.

https://etrecheck.com/

Feel free to post the results here so people can help you figure them out.

You might also run Malwarebytes:

Malwarebytes for Mac—Mac Antivirus Replacement | Malwarebytes

All such antivirus software should be avoided always. They do no good and only cause problems. Maybe if you follow the suggestion below we might be able to help you.

I suggest you use the program created by Etresoft, a frequent contributor. It will provide a snapshot of your system which we can analyze to possibly determine the cause of your problem. Please use copy and paste as screen shots can be hard to read. On the screen with Options, please open Options and check the bottom 2 boxes before running. Click “Share Report” button in the toolbar, select “Copy to Clipboard” and then paste into a reply. This will show what is running on your computer. No personal information is shown.

Etrecheck – System Information