I assume you have the full Norton package which comes with anti-spy?
For now try an on-line here
http://housecall.trendmicro.com/]
Click on "Scan now it's free"
A new page will open. "Click Scan now it's free" a second time
Place a check in the box "Yes, I accept the Terms of Use"
Press "Launch House Call"
Be patient, it's going to take a while. Let it clean all infection found.
If you get report of files that can't be cleaned / deleted please write down the filenames and locations and post that in your reply.