I have had this problem for a long time, despite the fact that my computer's specs are well above the minimum requirements. Every single time I open the Sims 3 it freezes just as the EA logo appears and the program stops responding. I am patched to 1.55 and have all of the expansion pack besides Island Adventures. I also have High-End Loft Stuff and Outdoor Living Stuff. I do NOT have any custom content, mods, or pirated games.
Here are the things I have tried, none of which have worked:
Running TS3 as administrator
Running TS3 in Windows XP (service pack 2) compatibility mode
Updating my video card
Making sure I had DirectX and an updated sound card
Starting TS3 in windowed mode (by changing the full screen setting in options.ini to "fullscreen = 0")
Removing my Sims 3 folder from My Documents/Electronic Arts
Reinstalling base game, expansion packs, and stuff packs (this one made my game work for a while but then it randomly started freezing again about a week after reinstall)
Adding all the application in the bin folders to the DEP exception list
Here is my DxDiag info:
http://pastebin.com/1ys2vtTCHopefully given all this information, somebody will be able to help me. Thanks in advance. I'm really not sure what else I can try that I haven't already so I'm at a loss.