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Scan for viruses in Safe Mode / Safe Boot (Mac)
Viruses are designed to deprive you of the pleasure to browse the net and download files quickly. The solution is to remove them; however, there are some viruses which may incapacitate your antivirus and prevent it from operating normally. If you try reinstalling it or install a different one, the result will be the same.
In a situation like this, you need to access the safe mode or safe boot (so that the virus remains inactive). If you are not sure how to get into safe mode, click don't know how to boot in Safe Mode guide.
Once you are in safe mode, download a fresh copy of an antivirus software and scan your computer. Since the virus (or viruses) is inactive it will be easier for the antivirus to delete it (them). Also, you can run a full malware scan with Malwarebytes' Anti-Malware to make sure that the virus(es) is(are) removed.