POP UPS

My computer keeps on showing this pop up every time.
Avast webshield has blocked a web page or a file
Object: http://www.system-maintainancepro.com/sm-version.php
Infection: URL:Mal
Process: C:.…|System Maintainance Updater.exe

Kindly help resolve this

Start a topic in V&W and post your logs there: https://forum.avast.com/index.php?action=post;board=4.0