Can't bring up Nvidia control panel

[bibarnes]

The control panel worked until about 4 or 5 days ago. I checked the Nvidia folder and I have 4 driver folders with the latest one back in March of this year. I don't know if this is related or not, but my picture thumbnails have stopped showing the picture and show what looks like a windows icon. It's a picture of two mountains with clouds above from sea.
Here is what my system specs are
Machine name: BILL-PC-1
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: HP-Pavilion
System Model: FQ565AAR-ABA a6700f
BIOS: Phoenix - AwardBIOS v6.00PG
Processor: AMD Phenom(tm) 9150e Quad-Core Processor (4 CPUs), ~1.8GHz
Memory: 4096MB RAM
Available OS Memory: 4094MB RAM
Page File: 2542MB used, 5549MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 11
DX Setup Parameters: Not found
User DPI Setting: 120 DPI (125 percent)
System DPI Setting: 96 DPI (100 percent)
DWM DPI Scaling: Disabled
DxDiag Version: 6.01.7601.17514 32bit Unicode
Oh yes I have a GEForce 8400

I also have 1.5Tb internal and 3TB external HD

I checked the driver and it is the latest.

Any and all help is appreciated.

[JAMES_911]

Can you make sure if there is no problem with the netframework 3.5 installation if your pc. The Nvidia Control Panel might not be opening because the graphics card could have gone wrong. Just check in device manager if Microsoft default video driver is enabled? Anyhow, try to download the latest driver from the nvidia website and then install it in your pc.