I assume this is a PCI card with an antenna on it at the back of the PC , they don't always pick up the best of signals as they can have interference from the PC itself , also they are shielded by being at the back . Is the card actually connecting to the router , what does it say when you hover the mouse over the single monitor icon on the taskbar ? Are you typing in the correct password , it's easily done to get the spelling or hex wrong ( hexadecimal letters A to F , numbers 0 to 9 ) . If your router ( and other PC's ) are on 802.11g ( 54Mb/s ) make sure that your new card is on the same , you can change the router via it's set up pages to run 54g only if all the other PC's support it and then change the new card to run that as well ( 54g only , no 11b ) , you can do that from the adapters settings in device manager , that would make a difference to range and throughput .Another thing to try is to temporarily turn the wireless encryption off and try connecting that way , if it is successful then you can re-set the WEP and maybe try a different key to see if that helps .
Another thought , make sure that the new card is on the same channel as the router , if you let Windows manage the connection that will happen automatically , otherwise if you are using the utility that came with the card you can enter it into that instead .
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