Sims 3 won't launch

Are you getting an error message ? Does the launcher start ?

The only thing I get is Sims3 launcher has stopped working

Try downloading the newest patch manually here:

http://answers.ea.com/t5/The-Sims-3/FAQ-Patch-1-63/td-p/67858/

Make sure to use the super patch.

Tried the super patch! Still the same message!

I am having the same problem you are. I just tried the super patch but my pc threw it back and said I already have it installed. The only thing I can think of to try, (because I have tried everything) is to remove my Norton antivirus and see if that solves the problem. The game was working perfectly fine up until three days ago.

Could you post your Computer's DxDiag?

To gather a DxDiag on your computer, please follow the steps here: http://answers.ea.com/t5/The-Sims-3/HOW-TO-DxDiag-for-Sims-3-PC-Only/td-p/1049584/

System Information
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Time of this report: 12/13/2013, 22:43:55
       Machine name: MYPC
   Operating System: Windows 7 Home Premium 64-bit (6.1, Build 7601) Service Pack 1 (7601.win7sp1_gdr.130828-1532)
           Language: English (Regional Setting: English)
System Manufacturer: Gigabyte Technology Co., Ltd.
       System Model: GA-880GM-USB3
               BIOS: Award Modular BIOS v6.00PG
          Processor: AMD FX(tm)-4100 Quad-Core Processor             (4 CPUs), ~3.6GHz
             Memory: 8192MB RAM
Available OS Memory: 8174MB RAM
          Page File: 2570MB used, 13774MB available
        Windows Dir: C:\Windows
    DirectX Version: DirectX 11
DX Setup Parameters: Not found
   User DPI Setting: Using System DPI
 System DPI Setting: 96 DPI (100 percent)
    DWM DPI Scaling: Disabled
     DxDiag Version: 6.01.7601.17514 32bit Unicode

------------
DxDiag Notes
------------
      Display Tab 1: No problems found.
        Sound Tab 1: No problems found.
        Sound Tab 2: No problems found.
        Sound Tab 3: No problems found.
          Input Tab: No problems found.

Sorry. Needed to add graphics card:

Card name: NVIDIA GeForce GTX 550 Ti
       Manufacturer: NVIDIA
          Chip type: GeForce GTX 550 Ti

Looks fine. Can't tell you if your graphics drivers are up-to-date from what you've posted though.

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Try the factory reset described in this post: http://answers.ea.com/t5/The-Sims-3/FAQ-Troubleshooting-Steps/td-p/714/

Yeah, I've upgraded my drivers so they're up to date!