I was running Tivo Desktop 2.2, Windows Media player 11, working fine. Tried upgrading to 2.5, can't play videos any more. It launches WMP, which displays something like "acquiring codec" & "codec acquired", but then no video or audio. If I go into file properties, there are no associated AV codecs, it just says "Media type: video" with most other fields blank. After I revert to 2.2 it works again, shows the Cyberlink PowerDVD codecs I am using. Any ideas on what I should be looking at to fix this?