Global keyboard hook works only in thread level

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C++

Windows

Win32

hooking

Hi. At first sorry for my English.

I have a problem with keyboard hooking. I made a small program that hooks the keyboard. It works in my computer, but if I run on another computer it works only if the application's window is focused. I found a lot of topics with this question, but none of them helped. I made a DLL file with the hook procedure, and I start hooking with an exe file. I have also a DEF file with exports so I can load the procedures from DLL, the only problem is that it's not works in other computers. I don't know if somebody faced this problem, but I hope that somebody can help me.

I'm using Visual Studio 2010 and Windows 7 Ultimate x64

And a remark: the hook dll is loaded only to hooker process.

Here is my source code:
DLL:

#include <Windows.h>

#pragma data_seg("Shared")
HHOOK hHook = NULL;
#pragma data_seg()

HINSTANCE hInstance = NULL;

void __stdcall Install();
void __stdcall Remove();

BOOL APIENTRY DllMain(HANDLE hModule, DWORD ul_reason_for_call, LPVOID lpReserved)
{
	switch(ul_reason_for_call)
	{
	case DLL_PROCESS_ATTACH:
		hInstance = (HINSTANCE)hModule;
		break;
	case DLL_PROCESS_DETACH:
		Remove();
		break;
	}
	
	return TRUE;
}

LRESULT CALLBACK KeyboardProc(int nCode, WPARAM wParam, LPARAM lParam)
{
	// processing data
	return CallNextHookEx(hHook, nCode, wParam, lParam);
}

void __stdcall Install()
{
	if(hHook == NULL)
	{
		hHook = SetWindowsHookEx(WH_KEYBOARD, (HOOKPROC)KeyboardProc, hInstance, 0);

	}
}

void __stdcall Remove()
{
	if(hHook != NULL)
		UnhookWindowsHookEx(hHook);
	
	hHook = NULL;
}

Hooker exe:

#include <Windows.h>

typedef void (__stdcall *FuncPtr)(void);

int main()
{
	FuncPtr Install;
	HMODULE hmodDll = LoadLibrary("DLL.dll");
	MSG Msg;
	if(hmodDll == NULL)
		return -1;
	Install = (FuncPtr)GetProcAddress(hmodDll, "Install");
	if(Install == NULL)
		return -2;

	Install();

	while(GetMessage(&Msg, NULL, 0, 0) > 0)
	{
		TranslateMessage(&Msg);
		DispatchMessage(&Msg);
	}

	return 0;
}

P.S.
This is just an experiment.