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