aclservice.exe is a mass-mailing worm Trojan.Gurepirls. aclservice.exe monitors user Internet activity and private information. It sends stolen data to a hacker site. Related files: %System%\acl.bmp %System%\acl.ocx %System%\aclservice.exe %Windir%\Downloaded Program Files\acl.inf More info: http://securityresponse.symantec.com/avc... Removal: Kill aclservice.exe process and remove aclservice.exe from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.