I just scanned every exe and dll file installed by YAC with VirusTotal. Every file was found to safe, except for the file libpng.dll which was detected as adware by VBA32. I'm sure that detection is a false positive. Next I scanned YAC's installer with VirusTotal, and it was detected by both NOD32 and Tend's HouseCall. HouseCall identified it as TROJ_GEN.F47V0829. I never pay much attention to generic trojan identifications. I also think that both detections are false positives.