Was the computer upgraded to Windows 10 from Windows 7, 8 or 8.1 ? If so there is a known issue with corruption of some of the systems files the procedure below will fix them - your Direct X / Sound files, which are part of Windows, may be corrupted.
Note this process can take a long time -
Start the computer.
Do not open any programs, on your computer keyboard press and hold down the Windows key and press the X key - a popup dialog box will open
Select Command prompt (Admin)
A dialog box will open, type in the following sfc /scannow and press Enter - note there is a space between the sfc and /scannow
When this has completed a message will be displayed - it may say some files canot be fixed - this is OK.
Restart the computer repeat steps 2 to 4 again.
Restart the computer - Direct X should now be fixed.