correction of "menace bloquée"

I get the pop-up window (see attched file) when I get access to a personnal website (WordPress) hosted by OVH.
What must I do to correct it ? (I can’t no more access to it for modification !)

Additionnal informations :

  • I get this with Chrome navigator
  • I get it also with Firefox navigtor
  • I get it on differnt PCs

How to suppress the Trojan on the OVH server ?
Thank’s in advance for your help

It has been moved to V&W, see: https://forum.avast.com/index.php?topic=207815.0