Please help me.  I have a virus on my computer.  I scanned it with the Norton Anti-Virus and the virus is deleted, but when I restart my computer, the virus is still there.  Here is the info that I have:

 

filename: C:\WINDOWS\ietlbass.dll
machine: DELL-8400
result: This file is infected with Trojan Horse

 

How do I go about on removing that file, virus, and get rid of it completely?  Please help me.  Thank You!