Avast keeps detecting an IP address attempting to infect my computer.

Every 10 minutes or so, Avast pops up in the corner yelling “THREAT DETECTED”, and I realized, it’s the same IP address every time, but with a different file sometimes. The Premium trial helps block it, but in a few days it’ll run out and something’s gonna happen.
It only shows me this one address.
http://37.48.117.50/4141/RelayDouble_142669288151773.dll
[/size]

follow instructions here and attach requested logs in next reply https://forum.avast.com/index.php?topic=53253.0