MPEG-1 decoding does come bundled with Windows (since 95). If you accidentally deleted it, you can get it back by reinstalling DirectX. (Ironically it’s NOT bundled with most versions of Windows Media Player.)
The latest version of DirectX 9.0c (November 2007 release) can be downloaded
here
majax79 wrote:
Also, Gspot tells me that I’m missing older version of WMV codecs.
That’s very vague. Can you post the specific error message from gspot?
Most Windows Media codecs are bundled in Windows Media Player, which you can download
here.