BSOD playing games, most recently L4D2. Caused by nvkflt.sys

Laptop Model : Asus N55SF, Nvidia Geforce GT555M, 8gb ram

Problem: BSOD playing most of the games which includes NFS, L4D2, Assasins Creed 3. The only games that don't BSOD are FIFA, Football Manager and WoW (DotA). Been living with it since few months after I bought it.

What I did: clean reinstall of drivers, throw the laptop to service centres (which doesn't help at all)

Note: Im trying my best to follow the rules of this forum, I've already created a crash dump folder. However, for the SF diagnostics tool, I cant seem to get it running, there is an error for the Minidump section. And does it take a long time for other sections to complete? because i left the diagnostics for hours but it didnt run at all. Thanks for understanding as I'm not good with technical stuffs at all and I will upload all the information needed when I know how to get the SF diagnostics running

Im having trouble doing the diagnostics. Im uploading the most recent BSOD screenshot as an information. I only have this information and i really need help on how to do diagnostics. I really need some replies from the pros around the forum.

I need help... im getting error at the minidump section. So i tried doing one by one except minidump but it seems the diagnostic is taking forever... Im counting on you for help as i really need to get the diagnostics done

Here's the code

************** Exception Text **************
System.IO.IOException: Could not complete operation on some files and directories. See the Data property of the exception for more details.
at Microsoft.VisualBasic.FileIO.FileSystem.FxCopyOrMoveDirectory(CopyOrMove operation, String sourceDirectoryPath, String targetDirectoryPath, Boolean overwrite)
at Microsoft.VisualBasic.FileIO.FileSystem.CopyOrMoveDirectory(CopyOrMove operation, String sourceDirectoryName, String destinationDirectoryName, Boolean overwrite, UIOptionInternal showUI, UICancelOption onUserCancel)
at Microsoft.VisualBasic.MyServices.FileSystemProxy.CopyDirectory(String sourceDirectoryName, String destinationDirectoryName, Boolean overwrite)
at SF_Diagnostic_Tool.Form1.Button3_Click(Object sender, EventArgs e)
at System.Windows.Forms.Control.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ButtonBase.WndProc(Message& m)
at System.Windows.Forms.Button.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)


************** Loaded Assemblies **************
mscorlib
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.5472 (Win7SP1GDR.050727-5400)
CodeBase: file:///C:/Windows/Microsoft.NET/Framework/v2.0.50727/mscorlib.dll
----------------------------------------
SF Diagnostic Tool
Assembly Version: 5.0.0.6
Win32 Version: 5.0.0.6
CodeBase: file:///C:/Users/asus/Desktop/SF_Diagnostic_Tool.exe
----------------------------------------
Microsoft.VisualBasic
Assembly Version: 8.0.0.0
Win32 Version: 8.0.50727.5420 (Win7SP1.050727-5400)
CodeBase: file:///C:/windows/assembly/GAC_MSIL/Microsoft.VisualBasic/8.0.0.0__b03f5f7f11d50a3a/Microsoft.VisualBasic.dll
----------------------------------------
System
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.5467 (Win7SP1GDR.050727-5400)
CodeBase: file:///C:/windows/assembly/GAC_MSIL/System/2.0.0.0__b77a5c561934e089/System.dll
----------------------------------------
System.Windows.Forms
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.5468 (Win7SP1GDR.050727-5400)
CodeBase: file:///C:/windows/assembly/GAC_MSIL/System.Windows.Forms/2.0.0.0__b77a5c561934e089/System.Windows.Forms.dll
----------------------------------------
System.Drawing
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.5467 (Win7SP1GDR.050727-5400)
CodeBase: file:///C:/windows/assembly/GAC_MSIL/System.Drawing/2.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll
----------------------------------------
System.Runtime.Remoting
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.5420 (Win7SP1.050727-5400)
CodeBase: file:///C:/windows/assembly/GAC_MSIL/System.Runtime.Remoting/2.0.0.0__b77a5c561934e089/System.Runtime.Remoting.dll
----------------------------------------

************** JIT Debugging **************
To enable just-in-time (JIT) debugging, the .config file for this
application or computer (machine.config) must have the
jitDebugging value set in the system.windows.forms section.
The application must also be compiled with debugging
enabled.

For example:

<configuration>
<system.windows.forms jitDebugging="true" />
</configuration>

When JIT debugging is enabled, any unhandled exception
will be sent to the JIT debugger registered on the computer
rather than be handled by this dialog box.