^^Cool. I was concerned with the bootloader interface driver. That's perfect.
Once the driver issue is cleared, I think I can save you some time on the sdk install. Try this instead of downloading the full blown sdk:
Unzip contents to the root of your computer's C drive. Once you have the adb/fastboot driver installed from jhawkkw's instructs, plug in your tab to the pc via usb cable and go into clockwork. Don't choose any options in there, just let it sit there with all the options showing.
Now open a command prompt on your PC. Enter the following commands:
cd c:\ android-sdk-windows\platform-tools
Now let us know if it output your tabs serial #. That should give us a clue as to whether fastboot is going to work.