Once considered exotic, rootkits have now become a standard technique
employed by malware distributors. Unfortunately the very best rootkit
detectors are quite complex to use so in this update the editor makes
separate recommendations for average users and technical hotshots. Sadly a
number of the best products for average users are no longer being actively
developed . I suspect that is because most modern AV products have a
reasonable level of rootkit detection built-in so the market for stand-alone
products suited to average users is now quite limited. However if you want
the very best rootkit detection and are technically savvy then the top
stand-alone products are still your best option. That's why I use one myself
to supplement my AV scanner.
http://www.techsupportalert.com/best-free-rootkit-scanner-remover.htm