So, in research for a BHO remover for another poster here, I downloaded & ran Malwarebyte's JRT - just to see what it might offer. I thought I'd trust them. I do gratefully use their Anti-virus scanner on demand to supplement Defender, after all. And I've
sworn to pay up should it ever catch a thing Defender missed.
To my shock, JRT found stuff & just went ahead & deleted them - w/o asking permission! Either it - or Windows - did make a restore point, however. Who can analyze this report & help decide whether I should revert? My own rerearch...
(1) PCDoctor appears to be part of Dell. But it won't be long before I attack lots of Dell stuff in here.
(2) That searchscopes entry was part of McAfee (I think), called Secure Search...

...but I've uninstalled McAfee. Now, Secure Search is gone, & BING is the default. (Honestly, I'm not sure it was actually still working.)
(3) The folder "pc drivers headquarters" was part of Driver Detective, which I did once try when still Win 8.1. It said it wanted to replace two - but I never pursued that.
I think I've talked myself into keeping the deletions - but does anyone disagree? Here's the report...
Junkware Removal Tool (JRT) by Malwarebytes
Version: 7.6.3 (09.21.2015:1)
OS: Windows 10 Home x64
Ran by PCR on Sun 09/27/2015 at 1:10:58.32
~~~ Tasks
Successfully deleted: [Task] C:\WINDOWS\system32\tasks\PCDEventLauncherTask
Successfully deleted: [Task] C:\WINDOWS\system32\tasks\PCDoctorBackgroundMonitorTask
~~~ Registry Values
~~~ Registry Keys
Successfully deleted: [Registry Key] HKEY\_CURRENT\_USER\Software\Microsoft\Internet Explorer\SearchScopes\{EBD4B3CF-DD1C-4303-88AF-0FD62ABD0CBE}
~~~ Files
~~~ Folders
Successfully deleted: [Folder] C:\ProgramData\pc drivers headquarters
Scan was completed on Sun 09/27/2015 at 1:12:36.30
End of JRT log