I wonder what does this tool scans infact. HD? My Documents? Program Files? Windows directory? System32 folder? Memory? .... I played a bit with it. Loaded a new session of Shadow Surfer. I used about 100 malware files( viruses, worms, adware, spyware, rootkits etc). I copied them one by one in different locations of my PC and run a scan each time. and run a scan with PrevxCSI. All malware files were dormant ofcourse. My documents - no detection Program files folder- no detection Windows Directory- no detection System 32 folder- no detection Very strange. I did another test. I tried to see if it catches malware from memory or not. I executed two mlware samples( detectable by Prevx according to VT) and let them run in memory. I rescanned. Both were detected. In my opinion, it was better if they would have added a scan of System32 folder as well.