Code need fixing...........not amending if possible

Hi - i need to stop the code deleting the first four rows........just that.


Sub deleterows()
Dim row_count As Long
Dim check_col As Range
Dim req_column As String
Dim req_numeric As Integer
Dim isvalid As Boolean

    isvalid = False
   
    Do While Not isvalid
        req_column = InputBox("Please Enter Column for sorting against :", "Select Reference Column")
        If req_column = "" Then
            req_numeric = True
        ElseIf IsNumeric(req_column) Then
            req_numeric = CInt(req_column)
        Else
            req_numeric = col_convert(req_column)
        End If
        If req_numeric >= 0 And req_numeric <= 256 Then isvalid = True
    Loop
    Set check_col = ActiveSheet.Cells(1, 1)
    For row_count = ActiveSheet.UsedRange.Rows.Count To 1 Step -1
        If Range("a1").Offset(row_count - 1, req_numeric - 1) = "" Then
'            Debug.Print "Delete row " & row_count
            Range("a1").Offset(row_count - 1, req_numeric - 1).EntireRow.Delete
        End If
    Next

End Sub
Function col_convert(req_column As String) As Integer
Dim charcount As Long
Dim temp_num As Long
Dim temp_string As String

    For charcount = 1 To Len(req_column)
        If Mid(req_column, charcount, 1) Like "[A-Za-z0-9]" Then temp_string = temp_string & Mid(req_column, charcount, 1)
    Next
    If Len(temp_string) > 2 Or Len(temp_string) = 0 Then
        col_convert = 0
    ElseIf Len(temp_string) = 1 Then
        col_convert = Asc(LCase(temp_string)) - 96
    Else
        temp_num = Asc(LCase(Right(temp_string, 1))) - 96 + (Asc(LCase(Left(temp_string, 1))) - 96) * 26
        col_convert = temp_num * Abs(temp_num <= 256)
    End If
End Function