Common troubleshooting steps/suggested fix:
1. Trash Special Force using Add/Remove or Programs & Features List (vista)
2. Delete the mygame folder under Program Files, then restart the computer.
3. DL the game client using a download manager, and install the client
4. DL the cumulative patch using a download manager, and install the patch.
5. (Optional) DL the manual patch using a download manager, and install the patch.