Heres what I did to get it working:
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I happened to already have ADB drivers for the Samsung Galaxy Nexus installed, if you don’t, you need to download those.
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Plug in the Nexus 7 and windows will find 2 drivers automatically, but won’t find any for “Nexus”
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Go to Device Manager, under “Other Devices” you’ll see “Nexus” with the yellow exclamation mark, Right Click>Upate Drivers>Let me choose>Let me pick form device drivers on my computer.
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Scroll down to “SAMSUNG Android Phone” (Again, the Galaxy Nexus drivers should be installed already, if not, find them), and choose the driver for “Android ADB Interface”
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Click “Next”, and the device should pop up in Eclipse.
It worked for me, at least.