CCCP Codec pack
Since the Codecs are vital when working with or using video clips on your PC it important that you are covered as good as possible. This was troublesome in the old days but nowadays it is quite simple. The friendly people at the CCCP-Project have made it very easy to get rid of the codec problem in one simple install. Follow this youtube video by the user Dalaiyoda if you want a 90 second understanding of what I mean with simple install.
You own opinion
Please read more about CCCP and create your own opinion before taking my word for it. Wikipedia is a very good starting point with lots of links and resources on the subject of codec packs. To the CCCP page of Wikipedia