Yahoo mail

I have:
HP pro 3500 Series computer
4.00 GB RAM
64 Bit operating system
CPU G870 @ 3.1 GHZ
Windows 7 professional
Service pack 1
Using AVAST security free software




Every time i open my yahoo mail I get warning that " A Threats HAS BEEN DETECTED"
what CAN i DO TO GET RID OF THAT threat

 

Here is what the screen say:


Infection blocked
URL hxxp://125032913.secured-ssl-cert33939e3939.com/c.php?aid=165&lid=108834
Infection URL:Mal
Relax, your avast! just saved you from a virus.
Protect yourself against other types of threats by upgrading now.

 

Delete the problem email. It has an image linked to a site that is triggering the warning.

Here is a link on disabling images in Yahoo Mail: https://help.yahoo.com/kb/block-images-displaying-emails-sln5043.html

 

Show images in email is set "Never by default"
Will watch for few days if the problem is solve.

 

Thank you for your suggestion