I just downloaded the AceMegaCodecPack 6.03 Prof.Edition. In the setup mode I chose the full program, every codec and filter possibly. Just to make sure I have for every problem the right tool. Everythings working fine, except Mpeg-1. These videos always are stopping in the middle for about a second, then continue playing. Can somebody please give me an advice to fix it. I appreciate every answer. Thank you.

GPL MPEG-1/2 DirectShow Decoder Filter may help in this case...

However, i recommend you to read this small guide before installing a bunch of unuseful codecs:
http://www.free-codecs.com/guides/What_Cod...hould_I_Use.htm

Gonna try it. But I think youre right, maybe I should deinstall it and only download the codecs I really need. Should have been here earlier. Thank you a lot for replying so soon.