H Sharon, and Welcome to Tom's Hardware!
Well, the MS Win-7 compatability list says Apartment Life Sims 2 is compatable with the 32 and 64 bit version. There are also several other posts about problems with it.
Might try it in Windows Compatability Mode. Find the program file that starts the program (executable), right click on it, choose Compatability, and choose the version that it worked in previously. Can set it that way for all users also.
Even thought MS doesn't show any compatability problems, might post the question in the MS Games Forum and get an easy fix.
Let us know if the compatability mode works for you.