Antiviruses can definitely slow down your computer, and they are by no means an sure-proof method to protect yourself. For those who don't want to the them, there is already one security software that comes pre-installed with every Windows OS called Microsoft Malicious Software Removal Tool (MRT). Here is how:



1. Click on the Start Menu
2. Click on "Search"
3. Type "mrt" and press ENTER
4. Click "Next"
5. Select one of the scan methods, and click "Next"
6. Wait until the scan finishes and delete the viruses by following the instructions given



P.S. Keep in mind that this software HAS NO REAL-TIME PROTECTION and its scanning capabilities are limited when compared to modern antiviruses.