Sub HiglightFromActiveCell()
Dim lastRow As Long
Dim i As Long
Application.ScreenUpdating = False
[COLOR="Red"] '// Last Row containing data
' lastRow = Range("A:K").Find("*", , , , xlByRows, xlPrevious).Row
'// All Rows (can take a while especially on Excel 2007 +)
' lastRow = Rows.Count[/COLOR]
'// Specific Row number
lastRow = 100
If ActiveCell.Row > lastRow Then GoTo EarlyExit
For i = ActiveCell.Row To lastRow Step 3
'// Fill color yellow = 65535
Range(Cells(i, "A"), Cells(i, "K")).Interior.Color = 65535
Next i
EarlyExit:
Application.ScreenUpdating = True
End Sub