Hi! I am an Independent Advisor and a Microsoft user like you. Do take note that as independent advisors we are not responsible for the development of Windows or the computer hardware and its drivers. I will try my best to help you out regarding your issue.
Please note that this is already a known issue with Windows Defender. Windows Defender identifies the same PUP/threat as a threat repeatedly, in your case, it is the PUA:Win32/CoinMiner. Kindly read the link below regarding this info. I strongly suggest that you perform the workaround mentioned on the Microsoft article.
https://answers.microsoft.com/en-us/protect/for...
NOTE: As mentioned in the article, we would need to wait for a FIX coming from Microsoft regarding this Defender issue and use the suggested workaround in the meantime.
TIP: As an additional protection to your computer you may also download the free version of Malwarebytes, it is a freeware that you can use to scan, detect, and delete viruses.
Download the free version from this link
Once installed please make a full scan. You may remove this Malwarebytes if you wish once you are done using it.
Let us hope for the better. You may check the community and Microsoft website from time to time. Better to perform a Windows update on your computer once a new one is available or once it prompts you for one. Stay safe!
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Standard Disclaimer: There are links to non-Microsoft websites. The pages appear to be providing accurate, safe information. Watch out for ads on the sites that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the sites before you decide to download and install it.