bt vision help needed please.

Hi
I had Bt vision and a wired desktop in my front room.I decided that i wanted to put the Bt Vision upstairs,but leave my desktop downstairs.My tv works fine ,but i can't seem to connect to my desktop downstairs anymore.If i want to use it i have to bring the Bt Hub down and connect it that way..Is it possible to have my hub upstairs with Bt vision and have a connection downstairs? Will i need to buy a wireless usb to use for my pc downstairs? I'm not sure how they work.thanks in advance
btw i'm on Vista home OS.
Regards
Andy

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