Help with video codecs needed please.

I have just bought a Dell Inspiron Mini. Very pleased with it. Also bought an external DVD Drive for it. I have installed this no problem, however, I can't get any DVDs to play as it says I am missing a codec. I have tried to download it from Microsoft but it still doesn't work. I have had this problem before and can't remember how it eventually got sorted. If anyone could help I would be eternally grateful. I bought the mini to use primarily when I am camping, so if I can't watch the odd film when it's raining, it defeats the objective of why I bought the Dell in the first place.

 

http://www.free-codecs.com/download/K_lite_codec_pack.htm</p>

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Try downloading the klite full.
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Thanks for that. I'll give it a go later on.