Injection not working VB.NET

Hey guys and i'm here yet with problem, I do need some help with this as this is confusing. Basically I have a program I've been testing that injects a .dll into a process so let's say for example a crossfirecheat.dll injects into the process crossfire.exe and the cheat works. Now the problem is for some users for me i'm windows 8 64-bit and it works. and for my window 7 testers it doesn't. I have 4 people who have windows 7 64-bit but it doesn't work for them like it won't inject. So i'm thinking its people on windows 7 and windows vista? I have one person who reports it works on windows 7 32-bit but for the people on 64-bit windows 7 it doesnt.

Here is my code:

Module Injection
Private TargetProcessHandle As Integer
Private pfnStartAddr As Integer
Private pszLibFileRemote As String
Private TargetBufferSize As Integer

Public Const PROCESS_VM_READ = &H10
Public Const TH32CS_SNAPPROCESS = &H2
Public Const MEM_COMMIT = 4096
Public Const PAGE_READWRITE = 4
Public Const PROCESS_CREATE_THREAD = (&H2)
Public Const PROCESS_VM_OPERATION = (&H8)
Public Const PROCESS_VM_WRITE = (&H20)
Dim DLLFileName As String
Public Declare Function ReadProcessMemory Lib "kernel32" ( _
ByVal hProcess As Integer, _
ByVal lpBaseAddress As Integer, _
ByVal lpBuffer As String, _
ByVal nSize As Integer, _
ByRef lpNumberOfBytesWritten As Integer) As Integer

Public Declare Function LoadLibrary Lib "kernel32" Alias "LoadLibraryA" ( _
ByVal lpLibFileName As String) As Integer

Public Declare Function VirtualAllocEx Lib "kernel32" ( _
ByVal hProcess As Integer, _
ByVal lpAddress As Integer, _
ByVal dwSize As Integer, _
ByVal flAllocationType As Integer, _
ByVal flProtect As Integer) As Integer

Public Declare Function WriteProcessMemory Lib "kernel32" ( _
ByVal hProcess As Integer, _
ByVal lpBaseAddress As Integer, _
ByVal lpBuffer As String, _
ByVal nSize As Integer, _
ByRef lpNumberOfBytesWritten As Integer) As Integer

Public Declare Function GetProcAddress Lib "kernel32" ( _
ByVal hModule As Integer, ByVal lpProcName As String) As Integer

Private Declare Function GetModuleHandle Lib "Kernel32" Alias "GetModuleHandleA" ( _
ByVal lpModuleName As String) As Integer

Public Declare Function CreateRemoteThread Lib "kernel32" ( _
ByVal hProcess As Integer, _
ByVal lpThreadAttributes As Integer, _
ByVal dwStackSize As Integer, _
ByVal lpStartAddress As Integer, _
ByVal lpParameter As Integer, _
ByVal dwCreationFlags As Integer, _
ByRef lpThreadId As Integer) As Integer

Public Declare Function OpenProcess Lib "kernel32" ( _
ByVal dwDesiredAccess As Integer, _
ByVal bInheritHandle As Integer, _
ByVal dwProcessId As Integer) As Integer

Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" ( _
ByVal lpClassName As String, _
ByVal lpWindowName As String) As Integer

Private Declare Function CloseHandle Lib "kernel32" Alias "CloseHandleA" ( _
ByVal hObject As Integer) As Integer

Dim ExeName As String = IO.Path.GetFileNameWithoutExtension(Application.ExecutablePath)

Public Sub Inject()
  On Error GoTo 1 ' If error occurs, app will close without any error messages
  Main.Timer2.Stop()
  Dim TargetProcess As Process() = Process.GetProcessesByName(Globals.ProcName)
  TargetProcessHandle = OpenProcess(PROCESS_CREATE_THREAD Or PROCESS_VM_OPERATION Or PROCESS_VM_WRITE, False, TargetProcess(0).Id)
  pszLibFileRemote = Globals.DllLocation
  pfnStartAddr = GetProcAddress(GetModuleHandle("Kernel32"), "LoadLibraryA")
  TargetBufferSize = 1 + Len(pszLibFileRemote)
  Dim Rtn As Integer
  Dim LoadLibParamAdr As Integer
  LoadLibParamAdr = VirtualAllocEx(TargetProcessHandle, 0, TargetBufferSize, MEM_COMMIT, PAGE_READWRITE)
  Rtn = WriteProcessMemory(TargetProcessHandle, LoadLibParamAdr, pszLibFileRemote, TargetBufferSize, 0)
  CreateRemoteThread(TargetProcessHandle, 0, 0, pfnStartAddr, LoadLibParamAdr, 0, 0)
  CloseHandle(TargetProcessHandle)
  Login.Close()
End Sub

End Module