Kl21.dll is a Spyware.KeyLover. Kl21.dll logs keystrokes. Kl21.dll monitors user Internet activity and private information. It sends stolen data to a hacker site. Related files: kl21.dll KeyLover21.exe kll.dll KeyLoverLite.exe KuninsT.exe More info: http://securityresponse.symantec.com/avc... Removal: Remove kl21.dll from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.