I've recently been having this similar problem with my netgear adapter which has stopped my internet from working on my laptop, and have searched on my PC for help on the matter, and found this message board to which I was quite suprised to see fairly recent posts about others having the same problem.
My signal strengh is excellent, my latop says I'm connected to my network, but everytime I search on firefox/IE, I get 'Paged cannot be displayed' .
This is very frustrating and I'm pretty confused. My IPOD touch connects to the adapter but my laptop does not.
Anyone with any suggestions would be much appreciated (if it involves complex computing terms, please could they explain it in a more step-by step approach, as I'm not that technically gifted!)