Windows defender definition update bugged?

A Spicy Noodle

Prominent
May 25, 2017
47
0
580
When I press check for updates it doesn’t show any results just the bar then returns back to normal and allows me to press check for updates again. Sometimes it’ll give an error and say protection definition update failed. Can someone help me solve this?
 

A Spicy Noodle

Prominent
May 25, 2017
47
0
580


What does this command do and I am using windows 10 if that matters.

 

rgd1101

Don't
Moderator
MERGED QUESTION
Question from A Spicy Noodle : "Windows Defender protection definition update failed"



 

A Spicy Noodle

Prominent
May 25, 2017
47
0
580


also what do I not type into the command prompt do I type cd and MpCmdRun.exe?