I recently installed the Sims Deluxe, Hot Date, House Party, Vacation and Unleashed (in that order) onto my Vista computer. Things worked great, I added some downloaded skins, nothing was slow, so I figured I'd install the Sims Makin' Magic too (I don't have Superstar). I installed it and it installed fine, and played fine. However, when I removed the disc from the computer, only to put it back in later, this:
 

 
error message popped up. I have installed no new expansion packs after the Sims Makin' Magic. I followed what it told me and it kept telling me to uninstall the Sims Makin' Magic. So I did, then it said that I had not downloaded the original Sims (which I had), so I put it in, installed Deluxe again.
 
At this point I got frustrated, and uninstalled everything, wiped it all clean and tried again. Same error message.
 
If anyone knows how to help, please, I'm desperate!
 
Thanks!