Why do my sound output settings keep resetting after restart?

Just bought a MBPro with OS 10.6.4.
After restarting my sound output settings keep resetting to Soundflower (2ch) from Internal speakers.
It doesn't take too much to change it, but it is pretty annoying and I'm assuming there's some obscure setting that can fix this.
Anyone able to help?

This fixed it on my Mac Pro. It might work on a MacBook Pro.
Delete these three files:
/Library/Preferences/com.apple.soundpref.plist
/Library/Preferences/Audio/com.apple.audio.DeviceSettings.plist
/Library/Preferences/Audio/com.apple.audio.SystemSettings.plist
Reselect whatever sound device you want as your default in the Sound Preference Pane.
Restart the computer.

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Why do my sound output settings keep resetting after restart?

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