How can I test my Windows 10 PC for a virus?

Hello ronlill1yahoocom,

Windows Defender/Security comes pre-installed with Windows 10. If you've not installed third-party AV, you can scan your system for virus via Windows Defender/Security.

If you've installed third-party AV, refer the AV vendor's instructions for scanning your system.

Hope this helps!

In case you have Windows 10, you may open Windows Defender and run a full system scan with it.

You may try Windows Defender Offline too, take a look at https://support.microsoft.com/en-us/windows/help-protect-my-pc-with-microsoft-defender-offline-9306d528-64bf-4668-5b80-ff533f183d6c