Not running Vista. Foobar2000 was shut down properly befor upgrade attempt. Have experienced the same once before when upgrading to current v0.9.4.3. But cant remember the solution.
OS: Win Xp Pro x64
Edit: Hmm, strange. Figured it out. Had to rename my existing foobar folder in program files. Then installing by ignoring the error message. Est voila; all playlist are there. Only thing missing was my colors. A bit of hell to get those back. But a small price to pay. No running v0.9.5 beta 7