I recommend you return your Matshita before assigning a region code.
from Frequently Asked Questions (READ BEFORE YOU POST)
16. Help! I'm having problems playing discs from other regions with my Matshita drive! Why?
Matshita (Panasonic oem) burners should really be avoided. They are cheap junk (which is probably why some laptop companies love these drives), die easily, and also suffer from region coding issues. Click
this
But if you absolutely want to assign a region code anyway . . .
from Frequently Asked Questions (READ BEFORE YOU POST)
14. Anydvd pops up with a message everytime I place this one dvd in the drive. The error message says unable to find CSS key due to region mismatch and that I need to set my dvd drive region to the same as the dvd to avoid this error in the future. Does anyone know how to do this?
a) You can usually ignore that error message, and Anydvd will still work properly with your burning program.
b) If you're still having problems, this is what you do
i. Right click the fox on your toolbar. Exit Anydvd
ii. Click start. Right click on "My computer"--->select "properties".
iii.Click on the 'Hardware' tab--->click the 'device manager' button.
iv. Open the dvd/cdrom branch---> right click on your optical drive
v. Click "properties".
vi. You should have a region tab. From there you can select a region.
vii. Select the region that you're in
viii. Start Anydvd
ix. click the fox icon on your toolbar. Go to Video dvd--->settings
x. Change the default to match the region on the disc
xi. Click Ok
