Hmm from my guess is that if you already haven't you HAVE to install the newer drivers if you are running w7. Here is where you can find the drivers, if you are running w7 32-bit than download those drivers, if you are running 64-bit than download those, also make sure they are the correct drivers from the download page. Just install them and it should work then, if not I am not sure what is wrong.
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^Go there and find your device, download the correct driver, install and that should hopefully fix your problems. Hope I helped