I've finally got my router all configured properly! It's now secure, and using all the right IP addresses and everything :) I feel geek joy. I'm also feeling like my laptop is too crufty at the moment and am seriously considering formating the windows drive and starting again. Preferably with a proper working version of Office and everything. Perhaps I'll take it into work and then it can churn away at that in the background while I get on with things.