Bluetooth problems

Two years ago or so, I bought a Kensington Bluetooth USB adaptor for my Dell laptop.  I probably bought it from Best Buy, but geeks.com is the only place I can find it online these days.  It was working a few weeks ago, but when I needed it today, I got this message:

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Bluetooth Setup Wizard
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Bluetooth device not found.
Please verify that your Bluetooth device is properly connected and turned on.
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OK  
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I can see the LED blinking when I plug it in, and the device manager claims that the hardware is functioning correctly, but the software keeps thinking that nothing is plugged in.  Since then, I’ve tracked down a more recent version of the drivers, but the only change is that I now get a blue screen of death (BSOD) a few minutes after booting that says that there’s a problem with btaudio.sys.  Removing that file prevents the BSODs, but I still get the same message.

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