However, there is a way to use both your antivirus program of choice and Microsoft Defender. RELATED: How to Periodically Scan Your Computer With Windows Defender While Using Another Antivirus
The process may run in the background, but it shouldn’t use CPU or disk resources attempting to scan your system. This means that Windows Defender is disabled. If you head to Windows Security > Virus & threat protection, you’ll see a message saying “You’re using other antivirus providers” if you have another antivirus program installed and activated.
Stuxnet: This worm is reported to have destroyed Iranian nuclear centrifuges by sending damaging instructions.If you do have another antivirus program installed (like Avira or BitDefender), Microsoft Defender will automatically disable itself and get out of your way. Conficker: This 2009 virus still infects many legacy systems and could do significant damage if it ever activates. In 2020, there’s now more malware on Macs than on PCs. Flashback: A Mac-only virus, Flashback infected over 600,000 Macs in 2012 and even infected Apple’s home base in Cupertino, Calif. FBI estimated cleanup and repair costs at $80 million. Melissa: The most dangerous computer virus in 1999, Melissa sent copies of itself that looked like NSFW pics. Explorezip: This worm used fake emails to spread to every machine on thousands of local networks. 
Sircam: A computer worm from 2001 that used counterfeit emails with the subject line, “I send you this file in order to have your advice.”. Tanatos/Bugbear: A 2002 keylogger virus that targeted financial institutions and spread to 150 countries. Storm Worm: This worm showed up in 2007 and attacked millions of computers with an email about approaching bad weather. Its financial cost has been pegged at $10.4 billion, but not reliably. Swen: Written in C++, the Swen computer worm disguised itself to look like a 2003 OS update. 
Yaha: Yet another worm with several variants, thought to be the result of a cyber-war between Pakistan and India.Mimail: This worm tried to harvest data from infected machines to launch a string of DDoS attacks, but was relatively easy to remove.Here are just a few more viruses that have wreaked havoc over the years: With a million new malware programs popping up every 3 years, we may miss the forest for a few outstanding trees. The top 10 worst computer viruses above are just the ugly tip of a gargantuan digital iceberg.
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