In full scan Windows defender reported Dynamer!ac. However when "Clean PC" was clicked, it hangs up (green bar stuck). Shows Trojan file in history. Vanishes if "Remove All" is clicked. But if you scan again, same infection is again reported. In my case the infected file is in Recovery portioned disc. How to get rid of Dynamer!ac?

Malwarebyte is a better anti-malware tool. Download,install and run this:

 https://www.malwarebytes.org/

Remove Trojan:Win32/Dynamer!ac (Virus Removal Guide)

Thanks. I tried. Kaspersky TDSSKiller scans C Drive and reports no threat. How do I make it scan the D drive (Recovery drive) where the infection is found?

Have you tried Malwarebyte?

If you can't find infection but still getting error pop up message then try a Clean Boot or may create another user account and recheck the issue.

Yes, I tried Malwarebytes. Followed Virus Removal Guide instructions. Step 1 was to use Kaspersky TDSSKiller. I also posted the question on Malwarebytes which has been replied as 'This is a well known false detection and don't pay attention to this'. Is it ok if I leave it at that?