Malware can:

• Steal your data

• Spy on your screen or keystrokes

• Lock your files and demand ransom (ransomware)

Trusted antivirus software:

• Windows Defender (built into Windows)

• Malwarebytes (great for removing existing threats)

• Avast / Kaspersky / Bitdefender

Tip:
Antivirus must be updated regularly—new viruses appear every day.