The recent (around November 12) update to Bitdefender Total Security 2013 ruined the on-access scanner. It's made my Windows 8 system so slow that even thumbnails take 10+ minutes to load. Tried uninstalling and re-installing BD, but that does nothing. As soon as the build 16.24.0.1682 update is applied and the system restarts, the problem returns. My only solution has been to disable the on-access scanner completely. Before this build, everything was working perfectly.