Why windows defender removes all files?

The problem started after one of the updates from the windows 10 enterprise 6.12
Browsers stopped downloading files, more download, mark allegedly the virus and removed.

Reset settings to default and turn off file validation in IE did not help.
Off defender via the control panel did not help.
sfc /scannow did not reveal.
Removing Windows updates didn't help either.
Antiviruses can't see anything.
Managed to get to download files by disabling the defender using gpedit

What is the reason of such behavior of the defender?
How can it be reinstalled?

Antivirusul in the company, so off a defender would not want to work.
June 10th 19 at 16:51
1 answer
June 10th 19 at 16:53
With flash there is no way administrered through Tim.

Find more questions by tags Windows