You don’t have to work it out, avast should dectect it.

My dilemma is I can't work out if I have this worm that I have been told I have

Who told you? What were the circumstances that made them tel you?

You shouldn’t require the Avast Virus Cleaner, unless you come accross something that the avast program can’t deal with directly. Then you should get back to us if you have a problem.

Is there something happening that makes you suspect that you have a problem? If so do tel us, or search on the forums for that behaviour.

Run a full scan with avast 4 home again.

What did the boot time scan, report when it first ran after you installed avast, was there any infection?

Did you check out any of the information in the google search link I gave you or search the forums for netsky?

Did you visit the Off Topic forum, Users-FAQ thread?

The more feedback you give us, the easier it is to try and help you.