How to fix Backdoor.Tidserv!inf

Hi ,

 

I am using symantex Antivirus and it has detected " Backdoor.Tidserv!inf " and unable to fix it. I have this problem from last one month. System is scaned on daily basis and i always get the same Backdoor.Tidserv!inf  pop-up saying unable to fix it.

 

 

Risk: Backdoor.Tidserv!inf

Action: Left alone

File: atapi.sys

File location: C:\WINNT\system32\drivers\

 

How to fix this issue?

 

Thanks