The last week or so, on brief scan setting which usually takes only about two minutes, the checking scan at the end of the scan is taking five or more minutes. In the past it was only a few seconds. Also, the last time the computer rebooted. I was not sitting there watching, but maybe the blue screen of death came up or something. I don't know. My OS is Windows 7, 32-bit. I am running Prevx 3.0 with only Windows Defender as additional security. The recent scan results have been clean. In fact, no detected items on this computer since May 2010.