AVG shields are off and can't turn them on

Hello Adrianus.
Thank you for contacting AVG Support Community. 
We're sorry to hear that you're facing this trouble.
We will certainly check and help you. 
Please repair AVG Antivirus free and check if that helps. Please refer to the below article to repair the program. 
https://support.avg.com/SupportArticleView?urlname=repair-avg-antivirus
After repairing the program, please reboot the PC once to apply the changes. 
Thank you and keep us updated.

Hi there, for several years I had no problem with the AVG programs. Since a couple of months, the shields are turned off and I can't get them turned off. 
I'm running Windows 10 and I don't know if Windows defender is the cause of it.
Can anybody help me to fix this?

Hello Adrianus.
Thank you for contacting AVG Support Community. 
We're sorry to hear that you're facing this trouble.
We will certainly check and help you. 
Please repair AVG Antivirus free and check if that helps. Please refer to the below article to repair the program. 
https://support.avg.com/SupportArticleView?urlname=repair-avg-antivirus
After repairing the program, please reboot the PC once to apply the changes. 
Thank you and keep us updated.