you don't need a codec pack to watch commercial dvd's
go to device manager, right click the drive, and see what region it is set to. (beware this setting can only be changed a limited number of times)
Sorry for my late reply and thank you for the responses. Anyway I have K-Lite Codec pack, thats only for other specific codecs. My drive is set to region 4. So would I have to change the region to say Australia, since I'm from Australia? or to another certain country?