For the security of the computer system, Microsoft has built its own security protection software in win7, that is, Windows Defender(original Windows AntiSpyware), which is often said that win7 comes with anti-virus software
As shown in the picture, open the Start menu of Windows 7
As shown in the figure, you can search for Windows Defender by typing "Defender" in the search box of the Start menu
As shown in the picture, I have installed third-party antivirus software, so Windows Defender is currently turned off
As shown in the picture, we click "Start now" and can see the state of being started
After Windows Defender starts, the interface will turn green
As shown in the figure, click the "scan" button at the top of Windows Defender to remove viruses on the computer, and the scanning speed is still very fast
As shown in the figure, you can also click "Tools" on the Windows Defender main screen, and then open "Options" to set Windows Defender to automatically scan the computer
This page is based on experience