Don't you just love it when someone tells you to do something without explaining the reasons why?
By using USB your PC is using up valuable resources on memory which is better spent elsewhere. You are much better off buying an ethernet card which can be brought cheaply (try
www.novatech.co.uk) and could even see a slight speed increase although don't expect miracles.
Another thing you can do is to uninstall the Connect software that is bundled with the installation CD. This doesn't do anything more useful then to tell you if you have a connection and the quickest way to do that is to open up a web page anyway. The less useless software you have loaded in memory the quicker your PC runs.
Other than that try moving to Worthing where chances are you'll be surrounded by old people thus having the whole street's bandwidth to yourself.
..or upgrade to a higher speed