>how to include a .dll file into the InstallShield?
>
>I want to include a .dll (XiCr50.dll from Crypto), I added it in the Files and Folders, when I installed the setup.exe in the new PC, I got an error message: Class definition XITECHCRYTOR.CRYPTOR is not found.

Right-click on the DLL in the InstallShield project and select Properties -> COM & .NET settings -> Registration Type: Self-Registration.