Url: mal explorer.exe

Hello,
I have a problem. Every minute avast pops up and tell me that it found infection:
URL: http://kjanskduhi8asdaskjdkn.in/index.php
Infekcja: URL:Mal
Proces: C:\Windows\explorer.exe

What should I do? I downloaded and tried using Combofix to aquire log (as was suggested in other thread) but it says that it doesn’t support Windows 8.1.

Please help.

https://forum.avast.com/index.php?topic=53253.0

Monitoring…