It's pretty hard to find 32-bit systems in the US, but globally, there is a lot of 32-bit hardware still in use.
It's probably a driver issue with either your sound or video drivers. It takes a long time for drivers to fully stabilize on new operating systems (it's a really hard engineering problem), and I doubt that a lot of energy is being put into 32-bit systems, particularly if they have really old (>5 year) hardware.
Please work through the video troubleshooting guide. In particular, check out the part about disabling hardware acceleration.
https://helpx.adobe.com/flash-player/kb/video-playback-issues.html
If you're still stuck, please follow the directions in the guide on providing the dxdiag report and additional information about what you tested and saw.