If your audio streaming of any media player suddenly seems to be dead and the system get you errors like "XYZ is not a valid Win32 application", maybe your quartz.dll is corrupted.
Browse your /system32/ directory and check the dimension proprierty of quartz.dll. If the file doesn't exist or he have zero dimension, download and replace it. No reboot is required!
Do you want to know why a system file can corrupt itself without a valid reason? Send an email to unclebill@microsoft.com.
