Here is how I installed the driver…As you know the tablet is not released yet, so the normal support channel is not available so I work with  the product group for support

1)      Unzip the drivers in a directory on the laptop

2)      Navigate to Settings>>Applications>>Development??USB Debugging

3)      Check the USB Debugging option

4)      I also checked the stay on when charging so I could watch the screen

5)      Plug in the USB cable between the ET1 and the PC

6)      Do not select  “Turn on USB Storage” on the ET1 when prompted—this will disable the debugging

7)      When the PC prompts  for drivers, select the option to install from a list or specific location

8)      On the next screen select don’t search…I will choose

9)      Browse to the folder where the USB drivers were inzipped

10)   Select the android_winusb.inf file

11)   Once it finished I was prompted to reboot my PC