"application has been blocked from accessing graphics hardware"

READ IT !! I FIXED IT FOR NVIDIA DRIVERS !!

I have nVidia GTX 580

The problem that Causes the Applications to be blocked from your graphics hardware is that you have wrong overclocking settings and by wrong i mean Unbalanced for example

For MSI nVidia & Radeon

1. Put your voltage ( Core Voltage to 1.1mV or 1100mV for after burner)

now my factory Settings are:

1000mV core voltage

Core clock (MHz) 795

Shader Clock (MHz)1590

Memory Clock (MHz) 2004

So basically my over clocking must be:

core voltage = 1100

Core clock (MHz) = 900

Shader Clock (MHz) = 1800

Memory Clock (MHz)= 2225

BUT NO !!! this is unstable !!! 900 Core clock and 1800 Shader clock needs more Voltage and more memory clock and that makes your GPU rejecting shaders because it holds more that it can read !!!

SO FOR THE FIX !!!

1. Re-install Fresh drivers from here:

http://www.nvidia.com/Download/index.aspx?lang=en-us

2. Uninstall MSI After burner and any other overclocking software and Re-install fresh one.

for MSI After Burner here:

download.msi.com/uti_exe/vga/MSIAfterburnerSetup.zip

3. Put balanced settings depending on the GPU you have, For example:

i have Memory Clock (MHz) 2004 that means i need 1075 Core voltage so

i Put my Core voltage 1100 and Memory clock 2225 stable but, more MHz in memory need more reading that means i need balance Shader with the memory clock so instead of 1590 or 1800 i prefer 1650, remember Core clock and Memory clock must be apart on 1/3.

HERE IS MY SETTINGS

core voltage (mV) = 1100

Core clock (MHz) = 825

Shader Clock (MHz) = 1650

Memory Clock (MHz)= 2225

Tips

every 125 Core clock you need 0.100 (mV)

every 1000 Memory clock you need 0.100(mV)

I had the same issue with my PC and it turned out to be the application software that was the issue. Try installing the driver withour installing any Nvidia or AMD software. 

How is the result?

rem Optimal setting for CPU > 1400 MHZ

game.setGameDisplayMode 800 600 32 0

game.setDetailTexture 4

game.setShadows 1

game.setEnvironmentMapping 1

game.setGraphicsQuality 3

game.setLightmaps 1

game.setRenderWhenSpawnMenu 1

game.setMenuViewdistance 100

game.setEffectsQuality 3

game.setPerformance 3

rem ** Favourite servers

LocalProfile.addFavouriteServer "127.0.0.1" 1024 "hostname 1"

LocalProfile.addFavouriteServer "127.0.0.2" 1025 "hostname 2"

LocalProfile.addFavouriteServer "127.0.0.3" 1026 "hostname 3"

LocalProfile.addFavouriteServer "127.0.0.4" 1027 "hostname 4"

rem ** Local profile configuration

LocalProfile.setLANServerFilter  0

LocalProfile.setINETServerFilter  0

LocalProfile.setLANServerSort  0

LocalProfile.setLANServerSortOrder 0

LocalProfile.setINETServerSort   0

LocalProfile.setINETServerSortOrder 0

LocalProfile.setVOArmyLanguage  0

LocalProfile.setPlayedVOHelp  "testing"

 etc,..

Battlefield 2 doesn't run now.. Help !!

I bought new ram so i have 2 sets of ram here, tried both but no resolve, after that changed motherboard and that seems to resolve the issue totally.

Just to be clear, you had different RAM in before?, So you were having this problem with different RAM chips, and are still having the same problem with new ones?

Or you have only tried 1 set of RAM, but it was new?

If you check my previous posts I tried swapping all hardware, 5 operating systems, they all worked fine except Windows 7 and up. 2 motherboards, 3 video cards from 3 vendors, AMD and Nvidia. 3 Different cases, 2 CPU,s, 3 hard-drives, 2 power supplies,tested my RAM, tested OK. Replaced it a year later, and $1500+ later. To find that it was the conflicting piece, it wasn't bad, it was for some reason causing this issue. 

The system has been running for 2+ years now, with Windows7,8,8.1 no problems.