Help with object manipulation

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VB

game

I seem to have a rather interesting problem with my code. Whenever I launch the code with an extra string in front of it such as Launcherfolder + it gives me some memory access error. However when I remove the string from in front of the "Minecraft.exe" it works fine when launching Minecraft.exe.

I need to launch the Minecraft.exe from another folder as you can see, but its not working. So the question is how do I fix this apparently simple problem because the solution escapes me. I think it will launch if minecraft.exe is in the same folder as the Application itself, but as I said I need it to launch from LauncherFolder and not the same directory.

Error: The system cannot find the file specified. (Exception from HRESULT: 0x80070002)

Public Class FrmClientScreen

    Public Property java As Object
 Dim LauncherFolder As String = Application.StartupPath & "\Killerbees Gaming Client\"


    Private Sub btnLogin_Click_1(sender As System.Object, e As System.EventArgs) Handles btnLogin.Click

java = CreateObject("WScript.Shell")
 java.Environment("PROCESS")("APPDATA") = LauncherFolder & "packs\" & CboMinecraftVersion.SelectedItem
 java.Run(LauncherFolder + "Minecraft.exe " + txtUsername.Text + " " + txtPassword.Text)

End sub
End Class