Hi ElizabethFlorence1,
I am an independent advisor and a Microsoft user like you, and I would be happy to help you out with this.
Windows Defender provides sufficient antivirus and antimalware protection for most users. And the best part is it is free and already included in Windows 10! There is typically no need to purchase any third-party software, especially if you are cautious and careful on clicking on suspicious links/content.
For more information, please visit: https://www.microsoft.com/en-us/windows/compreh...
Sometimes if there is malware that does get through, free versions of Malwarebytes anti-malware can help detect and remove the offending items.
I hope this has helped you. Please let us know if you have any further questions and we would be happy to help!
Regards,
-Ashton