Virus detected but unable to remove

          I have scanned the file with norton.  It detects it as a virus

      Trojan.Zeroaccessinf2.  It says manual removal required  I scanned in

      safe mode. It says manual removal required.

 

 I clicked on the link

      to take me to manual removal instructions.  I downloaded the manual

      removal tool.  It says no viruses found yet security suite says its

      still there.

 

 I followed step 2 and used NPE.  I then follwed step 3

      and used Norton Bootable recovery tool.  Both say removal failed and

      to manually remove it.

 

 At this point Im not sure if its even a

      virus since it was part of a windows patch in the following directory:

      C:\WINDOWS\$NtUninstallKB2536276-v2$

 

File name was:  mrxsmb.sys

 

 I am running the comcast

      version of norton which has been updated to version 5.2.1.3 with

      latest definitions

 

I submitted the file to norton falss positives website and they responded contact technical support.