Windows 10: Why wont Windows Defender remove a threat from my device?

Recently I was trying to download a few programs for my personal computer and I accidentally installed a fake program with a fake download link, which allowed my computer to download a Trojan malware file which I'm unable to remove from Windows Defender. The file has been on my computer for almost a week now, I don't notice anything suspicious with my computer but I'd assume I wouldn't with this type of malware. I've tried to remove, quarantine and even scanned my computer with Malwarebytes and removed it from there, but no luck it still appears in Windows Defender and says its active, I looke

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Defender wont remove the threats

I ran Windows Defender full scan which took over 15 hours to completed. It indicates that there are 20 threats which I want to remove. However Windows Defender gets stuck and does not remove any of them. It has been running for over 20 hours and nothing.
What can I do to remove these threats.

Thanks

 

WINDOWS DEFENDER IS NOT REMOVING THREATS

I'm having a problem with Windows Defender the threats found after I ran a full scan that last maybe around 10 hours cannot be removed by windows defender. I selected the remove option and it shows processing but after a while
the threats are still listed and active. I already ran a offline scan and a quick scan but neither fix the problem.

I already ran a secure boot and see if third-party apps are causing the problem but nothing works the threats are still listed and active. I checked the location of the file and manually deleted it even on my recycle bin but
the threats are still there and labeled as active. This very annoying. I think this is an error in the windows defender part because I installed Malwarebytes and ran a full scan which took a couple of hours and found nothing because like I've said I have deleted
the file location where the threats are.