So I have a Windows 8 computer. (HP 2000) that's only a few months old. I have the latest version of Internet Explorer and also Adobe Flash. But my videos are lagging really badly or if not lagging then they are not in sync. Anybody have any tips on how to fix this?
Go to Windows Store and install VLC media player.
It is free.
VLC has been widely used and recommended for older versions of Windows.
It is now available for Windows 8/8.1
Give it a shot. You might never need another media player again.