@miriam98 - I’d like to offer a “buyer beware” (even though you’re not buying) for anyone downloading antivirus software off the Internet. Be aware that some viruses actually masquerade as antivirus programs!
If you ever visit a website and suddenly get a weird looking popup telling you that your computer has been infected and that you need to download the antivirus program, don’t click on the link. That is a virus, trying to download itself to your computer.
My friend had this happen to him and the virus brought his computer to a halt. I spent hours getting his system cleaned up. I used real antivirus security software, anti malware software and even stuff to clean out his registry.
I had to reboot in Windows “safe mode” too so that no viruses would install upon startup. So the moral of the story is only get antivirus software by going to a reputable vendor’s site, not by responding to some popup.