The following should work OK if you want to do it in VBA: -
Dim ColsToHide As Range
Dim RowsToHide As Range
Application.ScreenUpdating = False
Set ColsToHide = Range("M:IV")
Set RowsToHide = Range("A34:A65536")
ColsToHide.EntireColumn.Hidden = True
RowsToHide.EntireRow.Hidden = True
Application.ScreenUpdating = True