Audio Problem with last Update

Question

ENG Audio playback does not work properly on Windows 8.1.
The same file heard on windows media player is faithfully reproduced. I think that the reason of this problem is the last update.
How can I resolve the problem?
ITA Non funziona correttamente la riproduzione audio su Windows 8.1. Lo stesso file ascoltato su windows media player viene riprodotto fedelmente. Credo sia a causa dell'ultimo aggiornamento.
Come posso risolvere il problema

Answer 1

There is an alternative downloader for 64-bit editions of Windows here:
iTunes 12.1 for Windows (64-bit — for older video cards)
that seems to address the playback issues that some users have been reporting with the full 64-bit version (the alternative installer here is the same architecture as most previous "64-bit" versions of iTunes, i.e., a 32-bit application with a 64-bit installer).  The "for older video cards" label appears to be something of a misnomer as some people have reported that this corrects problems found on current / high-spec systems.
Some users have reported that after installing this alternative version it is necessary to adjust the "Play audio using:" selection (normally to "Direct Sound" rather than "Windows Audio Session", though this may vary based on your audio hardware/drivers) in Edit > Preferences > Playback to restore glitch-free audio.