Hello Hans, I apologize for the inconvenience caused. Please refer the following link http://avgread.me/1Iy9KIl to run repair installation. If the issue persists, please re-install AVG antivirus free version. Kindly go through the below steps to re-install AVG.
Please run AVG remover tool based on your OS (32-bit or 64-bit) to completely remove AVG and then re install. To determine whether your OS is a 32-bit or 64-bit, please click on this link. http://support.microsoft.com/en-us/kb/827218
To download AVG Remover tool for 32-bit: http://download.avg.com/filedir/util/support/avg_remover_stf_x86_2015_5501.exe
To download AVG Remover tool for 64-bit: http://download.avg.com/filedir/util/support/avg_remover_stf_x64_2015_5501.exe
Please run the installation file for AVG antivirus free version from the below link.
http://avgread.me/ZbwGeh
Thank you.
It may perhaps interest you that the same thing happened when I started my PC this morning. The AVG Virus Free version is 2015.0.6140. Any idea why it happens?
/hans peter
Since this morning I get the redmarkt messages "Email not protected" , "EMS ist stopping" and the message "Email protection component is not active" in AVG Virus Free 2015.0.6125. (I should enclose a picture here, but don´t succeed to handle it.) Fix now-button does not help. What shall I do?
/hans peter
Hello Hans.
Sorry to hear that. I have sent you an email in order to get our additional support to resolve this issue. Please check your email spam or junk folder if not present in email inbox.
Thank you.
It may perhaps interest you that the same thing happened when I started my PC this morning. The AVG Virus Free version is 2015.0.6140. Any idea why it happens?
/hans peter
Thank you, Sreedevi. It may perhaps interest you that the repair did not work. I got the message "Installation failed. Error code 0xC0070643. MSI action failed." I used the AVG Remover tool instead and made than a new installation. For the moment AVG Free works again. 
/hans peter