Not uncommonly, rootkits are used to hide Trojans, that can then be used to take over your PC without your knowledge.
The free AVG Anti-Root is designed to protect you. It does one thing, and one thing alone: finds and kills rootkits. Run it and it scans your PC, sniffing them out. When it finds any, it removes them. Note that it doesn't work with Windows Vista.
--Preston Gralla
