Hi there Malwarebytes found 4 problems: all are copies of the same file, which is the executable produced by Visual Basic 2005 for a very simple example program WindowsApplication1 which I wrote in April 2006 and haven't touched since. I checked a backup I wrote to DVD in September 2008 and the same problems were found. Since that time the files have been scanned many times with Malwarebytes, Microsoft Security Essentials, and AVG (which I used until 2 October 2009). None of those scans found anything wrong, so it seems very likely that this is a false positive. I've re-run the scan using the command line /developer flag as instructed and the log file is attached. Also attached is WindowsApplication1.rar which contains the entire VB 2005 project, including the 4 instances of the .exe file which were detected. Regards John Greener WindowsApplication1.rar mbam_log_2011_01_01__13_11_04_.txt