Hey Guys, first post here..hope you can help me out.

Ive got a couple of Quictkime videos with the PNG codec (and a alpha channel). This file plays fine in Quicktime itself...

However, Im trying to play these on my player, which is potplayer. THe video starts, but then stutters and hangs.. I know it can play fluently cause it did play fine before I formatted my PC yesterday... Ive disable the internal codecs of the player, but im not sure which splitter/video decoder to use to make it work properly. It's says when I look at the file playing info..that the codec it's using is FFmpeg decoder, and I think that there problem lies there.. But I can't seem to change it...

It does play Quicktime (H264) or Quicktime (Photo Jpeg fine btw)..

Here are my specs:
So it's basically a clean install..did it yesterday:
Windows 7, 64 bit and the only codecs ive installed so far is the K-lite codec pack 64-bit. (Potplayer is a 64 bit player I believe)

Well, hope I you guys can help me out! Thank you in advance!