Hiya I have the sims 2 , sims 2 nightlife, sims 2 university, sims 2 glamour stuff and sims 2 pets and they all work fine. However when I try and play on the sims 2 christmas party pack and the sims 2 fesitive holiday edition they won't work, I have installed them. But once I put the disk and you press play it comes up do you want to install the game click yes and comes up saying it has already been installed and closes down. And there not under my programmes so can't uninstall them either and try agen. Do you know why this is happening and how I can play one them