The “registry key” solution is the most common solution offered, but it did not help me at all. Thanks to the last entry right above, I checked the systems 32 folder for the msacm32.drv file. The file was missing somehow.

If the registry key solution did not work for you or the key already existed,
check if the file msacm32.drv is present in your Windows system32 folder. (C:\WINDOWS\system32) If not, copy it from another PC (that has the same version of Windows) and place the file in the system32 folder. The file is 21 kb large and is also downloadable for free from file sharing websites,
you can google it, or simply download it here:

http://www.mediafire.com/?z5zztkdyong

Hope this entry helps you. BR.

I had the no-sound with flash player problem. The registry entry was there and the msacm32.drv was in my system32 dir, but still no sound.

So, I replaced the msacm32.drv with a copy from my i386 dir – same date, same file size – and it restored the sound. The file must have been corrupted somehow.

Maybe this will help, good luck.

Check if the file msacm32.drv is present in your Windows system32 folder. If not, copy it from another PC (that has the same version of Windows) and place the file in the system32 folder. This applies to Vista and 7 64Bit but in the SysWOW64 directory which is the folder for the 32 bit programs running on the 32bit virtual machine.

A very common sound problem is an incorrect or missing registry key for msacm32.drv discussed in the preceding.

1.Launch Registry Editor by typing regedit at Run command.
2. Navigate to the following registry key:

For XP and Vista 32Bit:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Drivers32

3. On the right pane, and check for existence of “wavemapper” registry subkey, the mail culprit
causing Flash no sound. If not found, create a new String value named “wavemapper”, and give the
entry value “msacm32.drv”. If wavemapper entry is already existed, ensure that its value data
is“msacm32.drv”.

For XP and Vista and 7 64bit:

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Drivers32

4. On the right pane, and check for existence of “wavemapper” registry subkey, the mail culprit
causing Flash no sound. If not found, create a new String
value named “wavemapper”, and give the entry value “msacm32.drv”.
If wavemapper entry is already existed, ensure that its value data is “msacm32.drv”.

5. In addition the permissions/security on these keys can prevent your browser flash plugin from
accessing them and preventing sound. Also if you receive errors editing or the key is blank you
need to check the permissions by right clicking on the key and choosing permissions. Choose
Advanced and make sure that the Administrators, System, Users Groups have “Full Control” under
permissions if not select them and click Edit and tick “Full Control” under the “Allow” column.