WikiDevi.Wi-Cat.RU:DD-WRT/TFTP first

The TFTP client in Windows Vista is off by default. If you haven't already turned it on, do the following:

   * Click on Start, then Control Panel.
   * Choose Programs, then Programs and Features.
   * On the left hand side, select Turn Windows features on or off.
   * When the list of features comes up, scroll down to TFTP Client and check the box next to it.