1. copy this wiaaut.dll to the system32 folder (c:\windows\system32 )
  2. Click the Start button.
  3. Type "command" in the search box... DO NOT hit ENTER yet!
  4. While holding CTRL-Shift on your keyboard, hit ENTER.
  5. You will be prompted with a permission dialog box.
  6. Click Yes.
  7. Type the following command: regsvr32 c:\windows\system32\Wiaaut.dll 
  8. Hit ENTER. This will REGISTER your file.
  9. Close the command prompt window.
  10. Re-start excel and try again.