To gain access to the registry, you can use the Tool developed by Symantec Security Response:

http://www.symantec.com/security_response/writeup.jsp?docid=2004-050614-0532-99

Now, download and run Norton Power Eraser tool :

http://www.symantec.com/norton/support/DIY/index.jsp

Check if it detects any threats and if it does, please provide us the filename and other details. Don't fix any files now, you can fix those after getting confirmation in this thread.

Yogesh