If you have VLC, here's how to fix it:
Open VLC. Go to the 'VLC' menu and select 'Preferences…' In the radio buttons in the lower-left corner of the window, change 'Basic' to 'All'. Click on 'Input / Codecs' in the left-hand side list. In the right-hand side frame look for 'Playback speed' and change it to 0.96 (use a comma if your system uses that as the decimal separator). Click on 'Audio' in the left-hand side list. In the right-hand side frame disable 'Enable time stretching audio'. Click the 'Save' button on the lower-right corner of the window. Quit and relaunch VLC.
Here is a command line switch example using VLC:
"C:\Program Files\VideoLAN\vlc.exe" "c:\palvideo.wmv" --no-audio-time-stretch --rate=0.96