You do not want this file.
kernels64.exe is missing because it is a file used by the virus you contracted and it went missing when you deleted it with Norton, you probably have a registry setting that tries to run the virus when you start up, download a tool called "hijackthis" which will scan the registry then get rid of the suspicious run entry in your registry.
or go to start menu, select run, type "cmd" hit enter key, type regedit hit enter navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run and delete the suspect registry entry from there.