Winimsg.exe is a Backdoor W32.Allim.A. Winimsg.exe spreads through America Online Instant Messenger (AIM). Winimsg.exe tries to terminate antiviral programs installed on a user computer. Related files: %System%\winimsg.exe Adds the value: "Windows iMessenger Messenger" = "winimsg.exe" to the Windows startup registry keys. More info: http://securityresponse.symantec.com/avc... Removal: Kill winimsg.exe process and remove winimsg.exe from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.