keyloggers can be categorized by calling them virus. it as hardware and software based spying your system without knowing users.
option 1 – remove any unknown software in your system by going to add /remove program. we always install add on and other software which comes as bundle and start spying your system.
there is way to avoid unattended installation in your system by use your user with limited permission and whenever you need to install some software install them by manually run as admin. it will keep your system safer always.
option 2 – install kaspersky internet security with latest update and run full system scan.
kaspersky is best antivirus if updated on timely manner. you can download from below link