Sound problem in my youtube - YouTube Videos

Also ensure and verify that the msacm32.drv driver file is existing in C:\Windows\System32 folder. If the file is missing in that location, search for other copy of msacm32.drv in the computer, or copy that file from another system.
the msacm32.drv on my drive but it wasn't to be found so i copied it from another computer and pasted it into my system 32 folder and oh man! instantaneously....I heard that windows sound... clidked over to youtube and bingo bango.. oh yeah baby! FOR YOUR LISTENING ENJOYMENT....THIS WORKS!
Solution:

1. Forget about all browsers and dont waste time.. :)

2. Insatll Microsof Outlook Express 2002 (or install microsoft office it comes with it)
In outlook express open and and you will see builtin browser, where u can browser as good as any conventional browser.

3. open your youtube files, playlists, or any sound or videos from any website..

4. Enjoy your music.

5. Please post if it works and forward it to everyone who having the same problem

5.. Successs!!!!!!!!
I had the same problem, but it ended up being a virus I removed and then it changed the permissions in the registry for:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion
\Drivers32
Download reginout cleaner to clean this easy way
I took off all of the restrictions (right-click > permissions), restarted, and it worked like a champ!