Dim R As Long
Dim N As Long
Dim V As Variant
Dim Rng As Range

On Error GoTo EndMacro
Application.ScreenUpdating = False
Application.Calculation = xlCalculationManual
Set Rng = Application.Intersect(ActiveSheet.UsedRange, _
                    ActiveSheet.Columns(ActiveCell.Column))
Application.StatusBar = "Processing Row: " & Format(Rng.Row, "#,##0")
N = 0
For R = Rng.Rows.Count To 2 Step -1
If R Mod 500 = 0 Then
    Application.StatusBar = "Processing Row: " & Format(R, "#,##0")
End If

V = Rng.Cells(R, 1).Value

If V = vbNullString Then
    If Application.WorksheetFunction.CountIf(Rng.Columns(1), vbNullString) > 1 Then
        Rng.Rows(R).EntireRow.Delete
        N = N + 1
    End If
Else
    If Application.WorksheetFunction.CountIf(Rng.Columns(1), V) > 1 Then
        Rng.Rows(R).EntireRow.Delete
        N = N + 1
    End If
End If
Next R

EndMacro:

Application.StatusBar = False
Application.ScreenUpdating = True
Application.Calculation = xlCalculationAutomatic
MsgBox "Duplicate Rows Deleted: " & CStr(N)