Hi Synyx. I'm Greg, an eleven years awarded MVP, Volunteer Moderator, and Independent Advisor here to help you until this is resolved.
There is more about that trojan which appears to be removed here:
https://www.microsoft.com/en-us/wdsi/threats/th...
You don't need the 3rd party antivirus. Defender found and took out the trojan. For second opinions and periodic on-demand scanning you only need the free Malwarebytes scanner which is the final word since nothing else comes close to it's thoroughness. Be sure and enable Root Kit scans in Malwarebytes Scan settings, and you can disable the premium real time which is unnecessary in Account settings.
If you want to add one other tool I'd add AdwCleaner free on-demand scanner from http://www.bleepingcomputer.com/download/adwcle... which finds other lower-grade adware and PUPs that especially infect browser add-on's.
If you think you were infected then it's also always a good idea to check System Files for damage by running System File Checker from Step 10 in this checklist:
http://answers.microsoft.com/en-us/windows/wiki...
I hope this helps. Based on what you report back I can answer any questions and may have other steps to perform. If you'll wait to rate whether my post was helpful, I will keep working with you until it's resolved.
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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.