Millions of people use Prevx 3.0 in this way for added security. They like the ultra-fast scans and the fact that Prevx 3.0 does not slow their PC in any way. Should Prevx 3.0 detect infections missed by your existing security product(s) you can always upgrade to add malware removal and protection at any time or report the infection to your existing security vendor. It's a great way to boost your PC security free of charge. Many Prevx 3.0 users run the fast scan to check their PCs several times a day