I tried Prevx for several days, and found these problems: 1. Piecemeal detection. When I installed it, Prevx ran a scan and detected two problems (both false positives). In the following days, it ran several other scans, but found nothing. Then I scanned the data partition (which contains installers for downloaded programs) from Windows Explorer, and 26 problems were found. 2. Too many false positives. In fact, all 28 problems detected were FPs. Examples: --Teepad.exe -- 2006 executable of the Treepad Lite outliner, that I have used dozens of times and has never been reported as malware. -- npmirage.dll -- 2006 file, not reported as malware by avast!, MBAM or SUPER. -- gui_mydefrag.exe -- GUI to run MyDefrag. 3. Prevx interferes with scans done with MBAM or SUPER. The message “authenticating file” appears continuously, and the scans slow to a crawl. The solution I found was to suspend Prevx for 10 minutes (the “installer” mode did not solve the problem).