Hi im confused... again. But this time its serious!

Im a Vista user, and its about the second time it happened but not with sims. So sometimes when I turn on the computer the windows loading screen gets stuck lol and then you've to turn off the computer then and it sort of restarts and then this wizard thing comes up and fixes the problem. Great but, yesterday... I installed the Mansion & Garden stuff pack, it was fine until today... I was quite surprised that the game started with a stuff pack, anyways, I went in game and it was fine but then after about a couple of hours playing the game, the game froze and you couldnt do anything. So I restarted the comp and then this dialog thing came on saying somthing about going back and some programs wont be installed or something but I said ok just couse its best for the computer.
On the desktop I saw that the mansion & garden stuff icon wasnt there and the latest sims 2 related thing was the Apartment life expansion pack. So like I always used to do, put in the AL disk and loaded the game, and everything was fine but not really, because the neighborhood icons like Pleasantview, Veronaville, strangetown, etc just werent there! There was only the icon create your own neghborhood! did it happen to anyone before?? PLEASE if anyone knows how to solve it please reply, I would really very appreciate it, Thanks in advance, and happy simming, troubled as always,
Cherrysims.
