Login Form Problem

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VB

Hi, I'm making a login screen that will be able to check to see if a file exists and throw an error message. The problem is that if I use (<> = True), even if the file does not exist it throws the error message. If I use just (= True) it does not throw error message at all. Below is the code I'm using. Thanks in advance.

Private Sub btnCreateUser_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCreateUser.Click
        Dim namefile As String
        namefile = txtCUserName.Text
        If namefile = "" Then
            MsgBox("Please Enter A Username")
            txtCPassword.Focus()
        Else : If txtCPassword.Text = "" Then
                MsgBox("Please Enter A Password")
            Else : If My.Computer.FileSystem.DirectoryExists("C:\AccountUsers\") Then
                Else
                    MkDir("C:\AccountUsers\")
                End If
            End If
        End If
        If My.Computer.FileSystem.FileExists("/txtCUserName.txt") <> True Then
            MsgBox("Account Already Exists, Use A Different Username Or Login", MsgBoxStyle.Information)
            txtCUserName.Text = ""
            txtCPassword.Text = ""
            txtCUserName.Focus()
        Else
            FileOpen(1, "C:\AccountUsers\" + namefile + ".txt", OpenMode.Output, OpenAccess.Write)
            PrintLine(1, txtCUserName.Text)
            PrintLine(1, txtCPassword.Text)
            FileClose(1)
            txtCUserName.Text = ""
            txtCPassword.Text = ""
            txtCUserName.Focus()
        End If
    End Sub