I have a windows vista x64 and I have problem to connect to internet via wireless connection. Actually the connection to the network is fine, but I cannot surf the net and a Limited Connectivity error is shown.

The strange thing is that if I change room everything on my computer works fine. For example, while in the livingroom, with a full wirless signal, I have limited connectivity, in the bedroom I can surf the net perfectly.
The router (D-Link) is in the livingroom and the bedroom is further!
I don't wont to work in my bedroom for a lifetime!!!

How can I solve the problem?
I also have 2 other computers, one with vista x86 and the other with xp, but they connect to internet perfectly even from the livingroom.
Thank you,
Francesco