You might be missing the SndDrv.dll file in your Crossfire folder... Or it could be corrupted.
https://www.mpgh.net/forum/290-crossf...nddrv-dll.html
Download the SndDrv.dll file in thread thread.^ Extract it and put it in your CF Folder...
C:\Program Files\Z8Games\Crossfire
^(Or whatever your hard drive letter is)