First, my skype didn't have sound effects so I uninstalled it then I reinstall the skype. The sound effect still not working so I downloaded the new version of skype ( beta one), I installed it then the sound effect still not working so I download the old version of skype then install it. The sound effect works but I lost all of my contacts and lost all of chat history. The chat history is really important for me. May you please help me to restore my chat history? Thank you.