I have this sync-eu.exe.bid problem. I found a thread on the problem and tried the fix, The fix didn't work after running JRT, adware cleaner, and Sophos I rebooted and lost both my Ethernet and wifi internet connections. I did not run the frst because I got a prompt that it may be harmful. Of course I couldn't download it anyway after trying to connect and repair my connections, I had to do a system restore to come here and post. I am using Premium 2.2.1.1043 version. This sync prompt only comes up for one website that I have noticed so far and after running these applications and getting back online I noticed the outgoing port number changed. Attach are the text files from JRT and adware.
AdwCleaner[C0].txt
JRT.txt