nkn.exe is a worm W32.Kelvir-BC. nkn.exe spreads via MSN Messenger. Related files: %System%\nkn.exe More info: http://www.sophos.com/virusinfo/analyses... Removal: Kill nkn.exe process and remove nkn.exe from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.
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