Sophos Anti-Rootkit scans, detects and removes any rootkit that is hidden on your computer using advanced rootkit detection technology. Rootkits can lie hidden on computers and remain undetected by anti-virus software. Although new rootkits can be prevented from infecting the system, if you had any rootkits before you installed your anti-virus, they may never be revealed. Removing rootkits without compromising system integrity is particularly challenging and needs to be done with care.