Kungfu_panda, I will let a moderator explain it but I would expect a cross posting warning.
On your problem since all but these two play ok on your PC & they play on other PCs.
You don't post which other PCs or how many .
I suspect it is a codec problem.
You either have an incorrect setting that is making you player handle this file type incorrectly . ffdshow for example .
Or you have conflicting codecs both trying to handle the same file.
I think if you check these two videos were created with some different video or audio than the ones that play OK on your PC.
So check & see what codecs you installed on both OSs.
Or the players you use installed for you.