Adware.Quadro Threat

When I ran my last norton virus scan yesterday it came up
with the Adware.Quadro threat. I tried to delete it and
it will not delete, so I followed the instructions that
sympantec gave me about running another scan and going to
the registry and deleting the file in the registry and I
did that and it worked however the problem is the file
called "emsw.exe" is still in the c:\windows\emsw
directory so therefore everytime I run another system
scan it detects it as a threat. I tried renaming it, I
tried deleting it but it says access denied. Help, I am
at wits end. Any help anyone can give would be greatly
appreciated.

Karen