HI probably the best thing to is put the threat in the virus chest and then from the virus chest send it to avast the threat will be sent to the avast labs to make a fix for the virus. The next thing I would do is go to the virus and worms section and go to where it says Logs to assist in cleaning malware click on that link and download otl and do a quick scanand also also download malwarebytes free and save that to your computer and update malwarebytes and run a quick scan with it save the logs from both of these programs. All of the instructions are in the link called assist in cleaning malware section.
If you have any further questions let me now.

thanks