New version of Avast turnes-off Windows Defender in W7 ?

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Hello, i am using W7-prof  with Avast Internet Security.

Until about a week ago i received te regullary updates for the (build in) Windows Defender W7
but now i see Windows Defender is switched-off in control pannel
( if i want to activate Defender a popup-box says: "this program is blocked by group policy" )

Wondering if this is set by avast latest version, otherwise there might be a problem elsewhere.
I know running Avast+Windows defender is not a good idea, but just want to what's happened with Windefender.

Thans in advance for any reply.

[Eddy]

Please (re)search before posting.
This has already been explained several times.

Windows 10 automatically disables Defender when a av is installed.
avast does it on Windows versions prior to Windows 10.

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Thank you, Eddy !

[bob3160]

In Windows 10, Defender is an on demand Antivirus Program and therefore needs to be turned off.
In Windows 7 and earlier, Defender is similar to Malwarebytes. Avast turns it off because it duplicates functions already performed by Avast.