I have the program Next DVD Ripper and I use it to convert video files to say MPEG 2 and it works good.

But now wen I convert a video file to MPEG 2 and then I go to play the file a window open that tells me
One or more Pins could not be found you may not have the CODEC needed to play the file.

What is going on I allways did this???

Go to safe mode & check for a virus.

try this untick media player classis in options when installing

Download K-Lite Codec Pack 5.70 (Full) - FileHippo.com

I have K Lite full.