perhaps you need to change the drivers for windows.. here is a driver that i have used that works..
when you plug your tablet in.. it should show up as 'Android Composite ADB Interface' in device manager under 'Android USB Devices' heading..
UPDATE: you may also try these drivers.. these should show up as 'Android ADB Interface'
http://www.mediafire.com/download/vk3dx5kr1j9i6p4/ADB_Drivers.zip
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