Cómo accedo a mi cuenta de Avast?
First, I’m an Avast user and not an Avast Team member.
You can use the World Icon to translate this reply.
Puedes usar el ícono mundial para traducir esta respuesta.

Two ways to do this:
- Via your Avast Installation User Interface (UI), Right click on the Avast Icon in the Notification area, select Registration Information, that opens that Avast User Interface there is a Go To Account button, you will have to enter your email address and password.
- You can log in via this url id.avast.com again you will need to enter your email address and password.
Edit:
It would appear Avast have changed this process as it doesn’t go to id.avast but to a new URL in which even my Avast Free registration isn’t recognised.
Are you using a paid version of Avast, if so you should be able to logon at the new site ?