Does Norton Detect Rootkit and Trojan Downloader Virus Infections?

After experiencing BSOD's routinely during disk defrag, and also experiencing random OS lockups, I decided to take my laptop into a local computer shop.  After they did a thorough diagnostics on my system, they determined that I was infected with a Rootkit and a trojan downloader virus.  The hardware checked out fine.

 

I am confused by the diagnosis.  

 

I acknowledge/accept that my laptop is having problems.  However, I have run repeated full system NAV 2013 scans in both regular and safe modes prior to and following the shop diagnosis.  All scans were clean.

 

I accept the fact that NAV is not a perfect solution.  I also accept the fact that NAV may not be able to clean a system of a Rootkit virus/infection, but shouldn't it at least detect these infections?  Particularly the Trojan downloader?

 

FWIW, I have also performed repeated full system Malwarebytes scans in both regular and safe modes prior to and following the shop diagnosis.  All scans were clean.


Quads wrote:
Norton should detect  Rootkits /  Bootkits once in the definitions etc.  

 

Quads, thanks for your reply, but your response confuses me  further.

 

Are you saying NAV detects Rootkits, and that because my NAV scans do not detect any Rootkit viruses, I am not infected with a Rootkit (contrary to my local shop diagnosis)?

 

Thanks in advance for your reply.

Definitions have to be updated all the time so AV software can detect new malware appearing every day, some malware are advanced and very clever.

 

If an AV product has no defintions it would not detect anything,  definitions are basically updated data to tell so Norton knows what to detect and how to deal with that detection.

 

All the shop gave was that you had a rootkit,   not what type or family name then that is too broad, it would be like saying the doctor says I had cancer, but nothing more, no what type or family of cancer.

 

Quads

After experiencing BSOD's routinely during disk defrag, and also experiencing random OS lockups, I decided to take my laptop into a local computer shop.  After they did a thorough diagnostics on my system, they determined that I was infected with a Rootkit and a trojan downloader virus.  The hardware checked out fine.

 

I am confused by the diagnosis.  

 

I acknowledge/accept that my laptop is having problems.  However, I have run repeated full system NAV 2013 scans in both regular and safe modes prior to and following the shop diagnosis.  All scans were clean.

 

I accept the fact that NAV is not a perfect solution.  I also accept the fact that NAV may not be able to clean a system of a Rootkit virus/infection, but shouldn't it at least detect these infections?  Particularly the Trojan downloader?

 

FWIW, I have also performed repeated full system Malwarebytes scans in both regular and safe modes prior to and following the shop diagnosis.  All scans were clean.