Though, rootkits have been in existence for a very long time. Enough said about that. What I do have to say, there is a new tool that can help find if you have any root kits installed on your machine.
What are root kits?
The term rootkit is used to describe the mechanisms and techniques whereby malware,
including viruses, spyware, and trojans, attempt to hide their presence from spyware blockers, antivirus, and system management utilities. There are several rootkit classifications depending on whether the malware survives reboot and whether it executes in user mode or kernel mode.
But, feel free to read my source of information....
http://www.sysinternals.com/ntw2k/freeware/rootkitreveal.shtmlthoughts?