Hi pouyspace, Please download this CrazyTalk 8 Registry Remover.zip file. https://drive.google.com/open?id=1CK_eh3KeP2k6RWDCAen0GDjaYTNOBT80 Follow the following steps: 1. Unzip "CrazyTalk 8 Registry Remover.zip" to a new folder. 2. Right click on CleanReg.exe and use admin privileges to launch. 3. Click Yes to accept the process. After you finished these steps, try to re-install CrazyTalk 8 again. Please let us know if it can solve the problem? Donnie Reallusion