We’ve already identified the problem – it’s a scheduled task named “BackgroundContainer” that’s attempting to run the BackgroundContainer.dll malware file, which has already been removed. The fact that the “startup item” for
the malware’s dll file is a scheduled task is actually “good news”, because it means that you don’t have to edit your registry, or use Autoruns, or uninstall/reinstall any program in order to remove the error message – all you have to do is delete the BackgroundContainer
scheduled task. I originally used a link for the removal procedure because that’s where you’ll also find the “authorization” and testimonials for the procedure. So here’s the proof that this procedure will work:
And, for the benefit of those who maybe just don’t understand what’s going on in that thread, here’s the procedure for removing the BackgroundContainer scheduled task:
Press the Windows key + R
Type “taskschd.msc”
Press the Enter key
Click on the Task Scheduler Library folder
Right-click on the BackgroundContainer task
Select "Delete”
Here’s a good removal guide that you can follow up with to make sure that all traces of the malware are removed: