how to inject code before AC loads

Hi guys,i�m having trouble with Xcrap..
What can i do to make my code work before xcrap loads and detects the modification?
VirtualProtections seems not working,even with correct syntax..

Code:

void WriteDWORD(DWORD *adr, int value)
{
	DWORD OldProtection;
	VirtualProtect((LPVOID)adr,0x01,PAGE_READWRITE,&OldProtection);//VirtualProtect((LPVOID)0x004C374F,1,PAGE_READWRITE,&OldProtection); 
	*(DWORD*)(adr) = value;//*(DWORD*)(0x004C374F) = 0x01; 
	VirtualProtect((LPVOID)adr,0x01,OldProtection,&OldProtection);//VirtualProtect((LPVOID)0x004C374F,1,OldProtection,&OldProtection); 
}

Code:

while(1)
	{
		HWND hWnd = FindWindow(0, "Priston Tale"); 

		if(hWnd)
		{
			GetWindowThreadProcessId(hWnd, &proc_id); 
			HANDLE hProcess = OpenProcess(PROCESS_ALL_ACCESS, FALSE, proc_id); 

			if(hProcess)
			{
				WriteDWORD((PDWORD)0x004C374F,0x01);
				WriteDWORD((PDWORD)0x004C37A7,0x01);
				WriteDWORD((PDWORD)0x004C37EC,0x01);

Code works a bit of SECONDS of time and xcrap closes game :mad:
Thank you.