my fujitsu siemens laptop wont play DVD'S?

Hi our Fujitsu Siemens E8010 Laptop on Windows XP Pro will not play DVD'S
It says that we need a dvd decoder MPEG-2 but as we are novices we havent got a clue what this is or how we get one. We have downloaded Quick time and various Media Fix-it programs but we aren't sure if this is the thing to do.

Please help because its driving us mad!!

Many thanks
 
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