Again, winamp 5 for audio.
Usually I use Ace DivX player for video, because it gets subtitles automatically, if available (if you have installed DivXG or GDivX, whatever the thingie was called). I am usually happy with a small program that needs no installation, and is called vplayer, also. And if I am just lazy, Media Player (I think 9 or 10) works fine too. For DVD movies - most often Power DVD player.