Read from and write to the same Excel file using VBScript

I am trying to find a solution to the following issue, but what I have found is not working for me so I am not sure what I am missing. 

I have a VBScript that opens and excel spreadsheet that has a header row of keyword script names, saves that name as a variable and in the next row it has an indicator if that script should be run or not.  If the indicator is Y then it uses the name variable to call the keyword test. It loops through these for each test case ID #. 

What I would like to add to this is that once the script is ran, it changes the indicator to "P" to indicate that the script ran. 

The problem I am running into is when it saves the file, it creates a new file in my My Documents folder, not to the same file and folder.  After looking at this, when the script open's the excel file it is opening it as read only, so it won't save any changes to it. I need to saved to the same file/folder because 1.  if the script stops half way through the test cases, I want to have it updated which test cases ran, instead of me doing it manually so I can start where they left off, and 2. I want to use those results later when running a report.

I have tried several things suggested in other topics, including SaveAs with the the current file's path, closing the excel file before opening it again to write to it, etc., but they are not working for me. I get that the file is read only, cannot write to readonly, etc.

Any help would be appreciated.  What am I missing?  I know some VBScript and newer to TestComplete, but I am still learning. 

This is my script.  I am using Excel 2007.

Sub testSuiteRun(scriptRunType, customerType, runComponentArea)
  Dim excelApplication, projectPath
  Dim sheetName
  'Open and set Excel objects, spreadsheet, sheet, row count and column count

  projectPath = Project.Path
  Set excelApplication = Sys.OleObject("Excel.Application")
  set book = excelApplication.Workbooks.Open (projectPath & "Test Data\TC_Script_Run.xlsx")
  excelApplication.Visible = True
  sheetName = runComponentArea
  Set sheet = book.Sheets(sheetName)
  rowCount = sheet.UsedRange.Rows.Count
  colCount = sheet.UsedRange.Columns.Count  
  tcCount = 1
  recordResults = "Y"
  'excelApplication.DisplayAlerts = False
  'Loop through rows of spreadsheet ignoring the header row
  For r = 2 To rowCount
    'check if active row = run type and customer type 
    If (sheet.Cells(r, 1) = scriptRunType And sheet.Cells(r, 2) = customerType) Then
      'Loop through component script columns     
      For c = 4 To colCount
        'Set test case name to the header cell (row 1) for active column and the run indicator for active column and row
        testCaseName = VarToString(sheet.Cells(1, c)) 
        runInd = VarToString(sheet.Cells(r, c)) 
        'Check if test case name is not blank for active col to eliminate extra blank columns   
        If testCaseName <> "" Then
          'check if run indicator is Y and if so then call that component script   
          If runInd = "Y" Then
            If testCaseName = "Global_PrimaryNav_Open" Then
               Log.Message(testCaseName) 
               'Call Eval("KeywordTests." + testCaseName + ".Run(""" + runComponentArea + """)")                 
            Else     
              Log.Message(testCaseName) 
              'Call Eval("KeywordTests." + testCaseName + ".Run")     
            End If
            If recordResults = "Y" Then
              sheet.Cells(r, c).Value = "P"
              book.Save
              'book.SaveAs (projectPath & "Test Data\TC_Script_Run.xlsx")
            End If
          End If
        End If
      Next
    End If
  Next

  'quit excel
  excelApplication.Quit
  excelApplication.DisplayAlerts = True

End Sub