If you wnat this game to play the levels ... go and get Lego Star Wars The Complete Saga, that's a more enhanced version of the game.
This one would be a nice to have for preservation.
The first version released on CD had a bad installer - or better: some genius renamed the CD for release without testing and the installer would not detect it. Lots of parents brought the game back to Walmart (or wherever). You had to downlaod a installer from the LucasArts ftp server that would recognize the CD name.
If you want, you can import savegames from Lego Star Wars 1, that unlock all the characters you have in that game. This gives you access to vehicles and abilities early.
The Complete Saga is teh better version of the game, but it misses the hub and some unlockables.