Windows 10: Can't custom scan a file in DOWNLOADS folder with Windows Defender

Why am I getting this message "contact IT help desk" to custom scan with Windows Defender

:)

 

Windows 10 Defender scanning downloaded files

Running Win10 Home 64bit on a MSI Z270-A PRO motherboard, i7-6700, 16 GB ram.
This is a new build for me and I just installed Win10 Home and did all updates.

When I download programs with Defender running, do I have to manually scan the file before installing the program?

When I tried to manually scan a downloaded program using the following method, it doesn't show results of the scan:

• Rt click the file name.
• In the pop up menu, click "Scan with Windows Defender"
• A window pops up showing "Full Scan", "Custom Scan" and "Windows defender offline scan", but no results of the individual file scan.

Thanks for any ideas.

 

Windows defender custom scan does not scan external drives

I have Defender Windows 10. I tried using custom scan to select and scan external drives. The screen listing the drives comes up, but the "OK" button remains grayed out so unable to scan any of the drives listed. Any suggestions would be appreciated.

 

Get Windows Defender to scan 1 file

Just started using Windows Defender.
What I need to do is scan 1 file just after downloading it.
When I right click on the file there is an option to "Scan with Windows Defender...", but clicking that brings up a window with choices to do a Full System Scan, a Custom Scan, or an Offline Scan . Using custom scan and drilling down I realize I can only scan the entire folder - it doesn't list individual files. Ignoring the clunky-ness, I still can't do what I want: scan the one file.

Is there a setting in Defender that will allow this?
(I swear it scanned a single file yesterday. But today I get this)