how do you know that your computer is infected with Conficker?

Well, according to some articles about that worm, your computer might be infected if you are being locked out of directory. Another is when a task has been scheduled on your PC. Another symptom is when you can't access "shared admin." Some websites have also stated that this worm was also designed to prevent its victims from accessing software security websites.

Update your virus definations for Norton and it will detected any infection if any in your system. This virus not only affects the individual computer but it also affects any client server communication as it delays the server response towards its clients. Take care.