HP Compaq Presario,Presario 800AP Supplementary Manual page 66

To change the DVD drive region setting, complete these steps:
1. With a DVD disc in the drive, open the Compaq DVD Player.
2. Click the DVD Options
of the player to open the DVD Options dialog box.
3. Click the DVD Region tab.
4. Select the desired region from the displayed map or from the
options buttons.
5. Click OK to close the dialog box.
icon on the lower left corner