kaspersky https://www.kaspersky.com.cn/free-antivirus
Avast https://www.avast.com/free-antivirus-download#pc
Avg https://www.avg.com/free-antivirus-download
Bitdefender https://www.bitdefender.com/solutions/free.html
Avira https://www.avira.com/zh-cn/free-antivirus-windows
