Please follow this guide and attach the logs from OTL, Malwarebytes and aswMBR (Not Win 8 and newer):
http://forum.avast.com/index.php?topic=53253.0
When done and logs are attached a malware expert will help you, for free by the way.
This is some malware that wants to call home or is loading some malicious site in the background.
Avast is able to detect these URLs but is unable to see the file that is causing this.