Why not contact your isp with all the relevant details of the ip addresses and times from your logs?

They should be able to monitor and contact the users if they detect an infected machine. My isp will put any suspected machine within a “walled garden” of web sites to address the problem with regards to malware removal. This might or might not be the case with your isp, but a report to abuse@ … might solicit a response.

Also make sure your machine is fully patched, and if you have any doubts about an infection try working through some of the excellent links provided here. A search for malware removal on the forum will yeild lots of results to many programmes to secure your system.

Quick edit! that would be yield! Sometimes my fingers don’t move at the same time as my thoughts :wink: