Video encoder help!!?

I have been making videos with adobe premier, then compiling, then using Windows Media encoder to reduce the size and make them better quality for youtube. Here is my issue. I have pictures for opening slides then it goes into the recorded video. At first windows media encoder would convert it to WMF fine and I had no issues. But here lately, the encoder keeps cutting out any picture or opening slide and goes straight to encoding video. The compiled version of the video shows the slides and audio as it should be but the encoder skips it anyways. I have tried 5 different types of encoders and the only encoders that "would" leave the slides in as it should be, were the encoders that couldnt adjust screen resolution or improve quality. Im stuck. I dont know if its in premier or the encoders. Helps me please.