Si no entindes del inglés, avisa.
Try:
1_ Avast main GUI -> settings -> troubleshooting -> disable the self defense module and save settings (don't worry about the messages, accept).
2_ search for the file "avast5.ini" (even if it is version 7 of avast); EDIT the file with notepad.
3_ in "avast5.ini", look for the "[common]" section. There should be an entry named "ShowSetupOutro".
4_ change the above entry "ShowSetupOutro" from 1 to 0 (zero).
5_ save the file and reboot.
6_ go back to avast main GUI -> settings -> troubleshooting -> enable the self defense module and save.
This is how was reported in the German forum. Please report back.