shellexec.exe is a Trojan W32.Rbot-ANC. shellexec.exe opens a back door. shellexec.exe tries to terminate antiviral programs installed on a user computer. Related files: %System%\shellexec.exe More info: http://www.sophos.com/virusinfo/analyses... Removal: Kill shellexec.exe process and remove shellexec.exe from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.