Excel 2007 : Highlighting Specific Collumns Macro

I am trying to use a macro that will highlight columns E and I of the rows that collumn L equals "XXXXXXX." How can I designate the columns to tie into the row?

Sub highlight()

Dim rg As Range, c As Range
  Dim firstAddress As String
    Set rg = Range("L9", "L5000")
    Application.ScreenUpdating = False
With rg
    Set c = .Find("XXXXXXX", lookat:=xlWhole, LookIn:=xlValues)
    If Not c Is Nothing Then
        firstAddress = c.Address
        Do
            c.Columns.Range("E", "I").Interior.ColorIndex = 4 "ISSUE IS HERE
            
            Set c = .FindNext(c)
            If c Is Nothing Then Exit Do
        Loop While c.Address <> firstAddress
    End If
Application.ScreenUpdating = True
End With

End Sub