I've been using Prevx for some time, and I've decided to uninstall it because of its consistent reporting of false positives and because of its negative effect on system performance. Since I've been using Prevx (v2 and v3), not once has Prevx reported errors correctly. For instance, numerous rootkits have been reported--often in software that's been installed for years (not newly-installed software). Additionally, Prevx has had a big hit on system performance because every program started must be checked by Prevx--no matter whether that program has been checked previously. Prevx has been a huge disappointment!!!