Hi gilmour59,
Read the sticky (in red) at the top of this section. It has so many tips & fixes for connection probs. Your thing might be due to sp2 (bloody pita), there are various patches you can get so that it lets p2p work. But first, go through the sticky & see if you find a fix there

**You shouldn't run Win & Norton firewalls together, it just won't work. Get rid of the Win