wrt54g Wireless Router

Hey i am using the retail build of win 7 and my wireless adapter wont pick up signals from my computer downstairs im wondering if it isnt compatible with win 7 i tried turning homegroup off and evereything. My router is a wrt54g wireless broadband router i egt internet downstairs(OS is XP) but i cant connect from my upstairs desktop which is win 7. please help me.

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