Mike, its the ubiquitous DG834Gv3. Because it's working (today), I'm reluctant to do anything and propose to wait until it doesn't 'connect' and then try it. But I didn't understand the term 'AP'. So do I simply remove the WEP key from the Router - does this have any effect on the other devices which will still have it in their settings?
Mad Jock, do you mean turn off Windows auto updates and then uninstall/reinstall the Atheros drivers?
SD - logic dictates that using a fixed IP address should work, but I'd need someone who knows what they are doing leaning over my shoulder. I do have the odd pal who would help so I might go there if I can pluck up the courage!!
Thank you all for your helpful suggestions; my son is amazed at the help available from those he regards as 'staunch aviators'!!