I had tried firstly the repair tool, without any success. Nothing changes.
Than next step were to reboot in safe mode, where the uninstall utility did the job to uninstall avast since the 5th vr.
The new installation of avast makes me happy.
For me this workaround did the job.
Talking about what previous poster said I think it is better check the IE Vr. update it if needed, than make again the steps like me, or maybe better update it (IE) without avast installed because it is not possible sandboxed.
Cheers!