Xvid hates me

I have a lot of video content encoded in Xvid, and a lot of programs that cannot recognize any of it. I have the Xvid codec installed, but still can’t decode anything I encode. Even when I use blender to encode a video to Xvid, it can’t read the same video it just wrote. The only programs that will read Xvid are VLC, WMP, and Virtualdub. Neither Blender nor any of my Sony products can.

So, what’s the deal? Did I somehow download a version that only encodes? Can someone link me to a different binary?

Help! I don’t want to have to transcode everything with VLC! Its dirty!