If you get a System Error indicating that xxxx.dll (avdevice-60.dll for example) was not found when trying to run DVDFab64.exe, you will need to reinstall the DVDFab program on your computer.

Here are the steps to do this:

1. Uninstall DVDFab: Go to the Control Panel on your computer and select “Uninstall a program” or “Programs and Features.” Find DVDFab in the list of installed programs, right-click on it, and select “Uninstall.”

2. Go to the Documents path and remove all the DVDFab13 relevant files.

3. Download the latest version of DVDFab: Visit the DVDFab website https://www.dvdfab.cn/download.htm and download the latest version of DVDFab13. Make sure to choose the correct version for your operating system.

4. Install DVDFab: Once the download is complete, right-click on the installer to run it as administrator and follow the on-screen instructions to install DVDFab on your computer.

5. Restart your computer: After the installation completes, restart your computer to apply the changes.