Unindentified user in Norton 360 Premier Edition Security.

Hii,

 

When i made a back-up on an extern harddrive today I noticed something was different. Since I had spyware on my laptop before back in August and September I recognised the issue. Only then the guest was in my system file, what resulted in me having to clean the whole computer and start all fresh.

 

I checked the Norton 360 file in programs and noticed I have an unwanted guest named S-1-15-2-1 in this file.

 

I tried to remove it, but acces was denied. 

 

How do I resolve this matter? 

 

 

S-1-15-2-1 Onbekende gebruiker in Norton 360 Premier Edition.jpg