it's not exactly a problem with xine. You need win32 codecs and libdvdcss. You can download them from the xine nightly
Another good thing to do since you are using Mandrake is to use "urpmi", Mandrake's package management tool. The instructions to setup urpmi are available at easyurpmi
. Make sure you select the PLF repository coz it contains a lot of packages that are not available on the default Mandrake installation due to patents or licensing issues. Using urpmi will give you access to a large amount of Mandrake packages and they can be easily installed by running "urpmi packagename" in a console as root or using the software module (RPMDrake) in the Mandrake Control Center.