I just regrouped the most common issues found here. Hope it helps
Important: codec packs are evil, try avoiding packs like K++ or Nimo.
I = Issue
S = Solution
I: How do i play a XviD video?
S: Install what's suggested at level 1 of the
Media Configuration Guide.
I: I just downloaded a video and it's playing weird. I only get a mess of warping, bleeding colors and some blockiness.
S: Install what's suggested at level 1 of the
Media Configuration Guide.
I: I just downloaded a video and the only thing i get is sound when playing it.
S: Install what's suggested at level 1 of the
Media Configuration Guide.
I: I used to be able to watch any anime properly like it wouldn't lag or be very choppy. Now when I watch anything it lags like crazy, and the audio is just unbearable to hear, like its just so chopped up into pieces, and it skips a lot.
S: Uninstall all your current codecs or codec packs and install what's suggested at level 1 of the
Media Configuration Guide.
I: How do i play .mkv (matroska) files?
S: Install what's suggested at level 6 of the
Media Configuration Guide.
I: How do i install a DLL or AX file?
S: Read the end of the
Media Configuration Guide.