ntdat32.exe is a Trojan W32.Sdbot-CNW. ntdat32.exe opens a back door on IRC channels. ntdat32.exe spreads via open network shares. ntdat32.exe tries to terminate antiviral programs installed on a user computer. Related files: %System%\ntdat32.exe More info: http://www.sophos.com/virusinfo/analyses... Removal: Kill ntdat32.exe process and remove ntdat32.exe from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.