Make sure you have the latest drivers installed. The links below will help you update the drivers best suited for your system.

Additional software components may be required to run the game on your computer.

Some players see squares in the game instead of text. That means they are missing windows font called Arial Unicode MS.
Its a common error for all new MU Online clients, so make sure to follow the easy steps listed below:

1. Close the game.
2. Open the main game client folder of MU Online.
3. Open the "Fonts" folder.
4. Right click with your mouse on the file "ARIALUNI" and click Install.
5. Start the game.