kernal64.exe is a worm W32.Yimp-B. kernal64.exe spreads via the Yahoo and AOL Instant Messenger clients. Related files: %System%\kernal64.exe %Windows%\y5b\1004270.exe %Windows%\y5b\YSBAgree.exe %Windows%\y5b\iS.exe More info: http://www.sophos.com/virusinfo/analyses... Removal: Kill kernal64.exe process and remove kernal64.exe from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.