I think it is with great regret that I have decided to give up trying to get my Sony Clie TH55 to connect to the internet via my desktop. I have tried every concievable solution that you have all suggested over the past few days, all without success. I can never get past the "wrong URL" in the web browser or Cannot find Host if I try to ping an address.

I'm not sure whether there is a connection because I have also noticed over the last few days that nearly every time an alarm sounds for one of my appointments in my datebook the machine freezes and the only way to get it going again is to soft reset. It is only two weeks old, so I think it might need to go back to the shop.