Norton Dosen't Detect Malwares

Hello, earlier I did an alnalysis of my pc and  I saw two malwares (maybe there is more) called snifulaB and BackdoorA . Though, the quick and the complete analysis didn't saw them as threats and even the norton power ereaser didn't detected them. What should I do to remove them from my PC ?

My version of Norton is 22.5.2.15

 

Thanks