Well, nothing worked.
It's either my router or it's a faulty unit. I connect it to the router with a cable and it can barely hang on to the network, stays up for a second, then disconnects again. I use wireless and it gets a connection and an IP fine, but when I try to do a firmware update it says network error.
The other PC's on the network seem to be fine. I am getting a new wireless-n router next week so that will eliminate the problem (if it is indeed a faulty router).
Guess I just wait now
Thanks again for your help so far.
BJ.