A. If your computer has the hardware-based support for playing DVDs, you can make the following registry change to enable WMP to play DVDs:

  1. Start regedit.exe.
  2. Go to HKEY_CURRENT_USER\SOFTWARE\Microsoft\MediaPlayer\Player\Settings.
  3. From the Edit menu select New, String value.
  4. Enter a name of EnableDVDUI for the new string value, then press Enter.
  5. Double-click the new value and set it to Yes. Click OK.
  6. Close regedit.
  7. To start playing DVDs, select File, Open, DVD, then click Play.