M-209 cryptographic device.

Cybersecurity Basics:
Viruses, Spyware, and Other Malware

Avoid Viruses, Spyware, and Other Malware

Make sure that any anti-virus software is enabled, and that it is constantly updated.

The Windows operating system itself now includes Windows Defender, which you should definitely have turned on.

Good free anti-virus / anti-malware software includes the following. ZoneAlarm incorporates spyware detection and removal software.
Avira AVG Avast! ZoneAlarm ClamAV ClamXav

As for non-free products, I have been very impressed with Kaspersky products. My mobile phone runs Android, and I have been happy with the free entry-level Kaspersky tool for Android. I would use Kaspersky anti-malware software on my other computers if they ran Windows. I use Linux almost exclusively, rendering this moot for myself.

Kaspersky
Rescue
Disk

The Kaspersky Rescue Disk lets you safely boot and clean infected Windows systems that can't be cleaned with the normal tools.

Yes, sure, if you're an NSA employee who very inappropriately takes home NSA offensive software, and you install that on your Windows PC, on which you had also installed Kaspersky software, then bad things might happen. But that went wrong in several ways at once that were not Kaspersky's doing. See New York Times and Washington Post stories for details.

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