Swmain.dll is a Spyware.ActivMonAgent. Swmain.dll opens a back door. Swmain.dll tries to terminate antiviral programs installed on a user computer. Swmain.dll monitors user Internet activity and private information. It sends stolen data to a hacker site. Related files: amagent3.exe amaware.dll dconsole.dll slgr.dll swkbhkl.dll swmain.dll swsys.exe More info: http://securityresponse.symantec.com/avc... Removal: Remove swmain.dll from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.