No sound anymore after patch and still no sound pre-patch

[oho]

Hi,
I installed the patch, started the game and everything was ok until a CTD occured. I deleted the cache files. After re-starting the game with the patch the sound is gone except the launching sound of ubi-soft. The cache files were created. When i reinstalled the original version, the sound is gone too.
All other games have sound.
Any help? I don't want to install the whole game again.