ClamAV scanning engine used in the ClamWin Free Antivirus has been updated to version 0.81. As the result ClamWin version 0.37.4 now shows an "outdated" warning when updating virus database.
New ClamWin Free Antivirus version 0.37.5, which upgrades ClamAV antivirus engine has now been released. Please download the it using this link
http://prdownloads.sourceforge.net/clamwin/clamwin-0.37.5-setup.exe?download