tcpctrl.exe is a Trojan.YSpy-A. tcpctrl.exe tries to terminate antiviral programs installed on a user computer. tcpctrl.exe monitors user Internet activity and private information. It sends stolen data to a hacker site. Related files: %Windows%\msagent\update.exe %System%\Decoder.dll %Windows%\tcpctrl.exe More info: http://www.sophos.com/virusinfo/analyses... Removal: Kill tcpctrl.exe process and remove tcpctrl.exe from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.