From the Youtube description:
Originally filmed in 1922, this version was updated in the mid 1960's to include English narration by William S Burroughs. The writer and director Benjamin Christensen discloses a historical view of the witches through the seven parts of this silent movie.
Burroughs obviously had some say over the translated narration, which is very amusing, and which features Burroughs' trademark take on "language as a virus" early on in the film. Also updated is the entertainingly discordant soundtrack, provided by French violin prodigy Jean Luc Ponty, among other Euro-jazzy session musicians. Worth watching, if you haven't done so already.