my result test a pack is diffrent with my friend's result

Hello, i have a problem : today i tested a malware pack ( 4 malwares ) and my Norton security product blocked 2/4 by download insight

and my friend test this pack too but result is : 4/4 by download insight ! 

when i scan with power eraser my result : 4/4 ( i scan 2 malwares that not blocked by download insight auto ) 

so i concern about it .. is my computer infected ? or something wrong with my norton product? 

 

i chat with norton support and he remote to my computer and he say my norton product work fine !