|Were you using the same operating system when you had the Sims Complete Collection installed previously ?|
You must install the sound software correctly.
The only difference in the following is you do this if you don't see Programs and Features in Control Panel
Windows 7 only
If you DID install drivers that way, go to Control Panel - display as Small Icons or Large Icons (not Categories) - Programs and Features and Un-install the software you installed, reboot, DO NOT install drivers while booting.
See response 2:
You could try searching the Electronics Arts (the maker of the game's) web site.
I searched for: sound
If some of the audio in the game seems to be missing (such as EVA voice announcements), this is likely due to improper speaker settings. If speaker settings are set to a surround-sound configuration, but there is NO surround-sound speaker system present, then some audio channels will not be heard during gameplay.
E.g. My Realtek sound adapter is set to simply stereo (2 speaker) output from the green jack by default in Vista. I can change that in Control Panel - Realtek something.
NOTE - that setting is independent of the number of speakers plugged in that the sound adapter has detected. E.g. you can have 5 speakers (two pairs and a subwoofer) plugged in and detected yet the sound output is still to one pair,
or, you can have just a pair of speakers plugged in and detected and have the sound output set to more than a pair.