Substitute Win7 USB drivers for ADB mode
This says you should be able to use the "google drivers" after some minor tweaking. If your device came with any software for your PC, it will have the "official" drivers though, and I recommend using them.


  
  You must have Android SDK installed before you can proceed. If
  you don’t have it already, proceed to
  our guide on what is ADB and how to
  install it. Make sure you download the
  Google USB Driver Package as well.
  Open the google-usb_driver folder that you will find inside your Android
  SDK folder.
  Open the android_winusb.inf file in notepad or any text editor to edit
  it.
  Add these lines under [Google.NTx86] or [Google.NTamd64]
  depending on whether you are using 32
  bit or 64 bit Windows. If unsure, it
  is safe to add these under both these
  sections.
  
  
  
    ;NVIDIA Tegra
    %SingleAdbInterface% = USB_Install, USB\VID_0955&amp;PID_7000
    %CompositeAdbInterface% = USB_Install, USB\VID_0955&amp;PID_7100&amp;MI_01
  
  
  Don’t edit or replace any other
  text that is already there; just add
  these new lines and save the file.
  
  
  Open a command prompt window and enter this command:
  
  
  
    echo 0x955 >> "%USERPROFILE%.android\adb_usb.ini"
  


You will also have to enable USB Debugging in Settings -> Applications -> Development.

edit I would try this first:

This site has the "official" drivers for the tablet. You will still have to enable USB debugging, as I mentioned above.