Sims 2 Holiday Edition won't install?

So a while back (october, i think) i bought sims 2 HE off amazon.com, and it worked fine. i installed all my expansion packs (i have all of them). But i got an actual laptop so i didn't have to use our old computer. so i installed all my expansion packs using double deluxe, and it went fine. but now i want to be able to have santa come in visit my little generation 5 kiddies for my legacy story, but i put in the first disk (there are 4, and then the holiday stuff disk) and my computer keeps saying "please insert disk number1." but i have and i take it out, put it back in, and it keeps saying "please insert disk number 1." any idea on how to solve this? btw, i am sorry this is so long.