In some cases, audio files encoded in iTunes 7.4 on Windows may sound distorted, or may play back with the wrong duration. This can happen if you choose a low bit-rate (80 kbps or lower) for encoding in iTunes preferences.
To prevent this issue, update to iTunes 7.5.
Important: Information about products not manufactured by Apple is provided for information purposes only and does not constitute Apple's recommendation or endorsement. Please contact the vendor for additional information.