Game Help:User Files-Remove All User Data
From SimsWiki
Rename User Data Folder
After you have confirmed that you have enough free space, then you will rename your user data folder.
To do this, first click Start, and then My Documents. Double-click on the "EA Games" folder to open it, and then right-click on "The Sims 2" folder. Choose "rename."
Type a new name to rename the folder - recommended is calling it "The Sims 2 Backup"
The purpose of this step is to make the game ignore these files - if your user data folder does not have the name it expects, it will not read your user data... which is what we want.
