i wouldnt touch that codec pack or similar codec packs with a 10 foot pole.
a while back i was recommended by someone else to get that codec pack, so i did, i installed it and after i installed it i couldnt watch dvds on my pc, i couldnt rip or write dvds and i couldnt encode divx or even play mp3s anymore either.
i tried for months and months to remove the stupid thing but it left shit behind and my system still didnt work properly. a format and clean install is the only advice i could find from even the nerdiest of nerds.
the rule i stick to these days is to just install the codecs you need. some codecs will clash with each other and cause some not to work.
the codec pack might work for some but it also doesnt work for others, if you search the net you'll find that the nemo codec pack and others like 'angel potion' are the source of many computing problems. although it all depends on what software and other codecs you already have installed, i personally dont think its worth the hassle.