I had this new pioneer dvd-rw from newegg, and brand new windows xp pro but I think I still missing something. Can you guys help me out please? I known it has something to do with decoder software or hardware but can't verify which to get or install.
The codecs that Windows Media Player can download and the klite codec pack are both for types of files (mpeg's and avi's) you would download. I thought you were saying that WMP will not play a DVD movie that you are attempting to play in your new DVD drive. For that you need a DVD decoder. I have never seen a free DVD decoder (I think there are royalties involved that prevent that).
You can easily determine if that is the case by downloading the free trial of WinDVD here: