Star Wars Knights of the Old Republic II: The Sith Lords

Why cant I get the launcher to respond?

• Star Wars Knights of the Old Republic II: The Sith Lords CD may have been removed.
  
  

• Your CD-ROM drive may have stopped responding.
  
  

• There may be a hardware conflict in your system.
  
  

• The Star Wars Knights of the Old Republic II: The Sith Lords CD may be scratched or dirty.
  
  

• Your computer may not be 100% DirectX 9.0c compatible.