In order to fix all major Ran Online problems, you need to check if your computer meets the minimum system requirements:
- Operating System: Windows 98/ ME/ 2000/ XP/ Vista;
- CPU: Intel Pentium 3 with 1.2GHz or AMD Athlon 1500+;
- RAM: 256 MB;
- Graphic Card: Geforce3 Ti, ATI radeon 9000;
- Hard Disk Space: at least 2G;
- DirectX: DirectX 9.0c.
If the requirements are fulfilled, configure your security program and Windows Firewall to allow the game connection and update DirectX. If you still have issues, uninstall the game, run a registry cleaner and download and install the updated version of the client.