A rootkit is a software program that enables attackers to gain administrator access to a system. It is installed by the attackers on systems when they have been successfully compromised.There are different approaches how to remove a rootkit from a computer.
1. Restart the computer. - the simplest approach.
2.Open msconfig and enable bootlog.
Click on the Start tab, then Run. Type in “msconfig” .Go to the “boot.ini” tab and tick “Boot log”.