EXE and DLL's

Afternoon all,

Got an issue making my exe available for use on others machines. I have created a C# windows application that has a panel which is hooked to a dll i have created that runs a map editor and some pathfinding algorithms. My problem is, I have sent the Release version to a friend to test on his machine and he has got an error

Description:  Stopped workingProblem signature:  Problem Event Name:	CLR20r3  Problem Signature 01:	t3dpathfinding.exe  Problem Signature 02:	1.0.0.0  Problem Signature 03:	4cbf0372  Problem Signature 04:	T3DPathfinding  Problem Signature 05:	1.0.0.0  Problem Signature 06:	4cbf0372  Problem Signature 07:	7  Problem Signature 08:	17  Problem Signature 09:	System.DllNotFoundException    OS Version:	6.1.7600.2.0.0.256.1  Locale ID:	2057

I thought that this could be related to the direct x dll being missing, so i sent him the correct direct x dll (D3dx9d_42.dll) that matches my SDK. and he then received this issue:

Description:  Stopped workingProblem signature:  Problem Event Name:	APPCRASH  Application Name:	T3DPathfinding.exe  Application Version:	1.0.0.0  Application Timestamp:	4cbf0372  Fault Module Name:	PathfindingSystem.dll  Fault Module Version:	0.0.0.0  Fault Module Timestamp:	4cbf041a  Exception Code:	c0000005  Exception Offset:	00004d65

On top of this i asked that he install the DirectX End-User Runtime but still no fix.

I have tried moving the release folder around my computer to see if there is any issue but all is ok on my machine. Anyone any ideas, or tips on what i should try?

Cheers