Cannot close WorkBooks ...

I tried other ways of closing it, but it is still in the Tast Manager ...
It opens it up and that's it ... how the hell do I close it
I use Microsoft Excel 11.0 Lib.

here is the code

VB Code:

Public Sub Check_Validity2()
On Error GoTo NoFile
    Set myBook = Workbooks.Open(strMainFilePath)
    exists = myBook.Worksheets("AH Data").Cells(1, 3).Value
    If exists = "AH1 (AH09-01)" Then
        exists = "true"
    Else: exists = ""
    End If
    myBook.Close savechanges:=False
NoFile:
    If Err.Number = 9 Then
    myBook.Close
    exists = ""
    End If
End Sub

I take it that this is entirely in Excel. So, you are wanting to close the workbook AND close Excel.
This will close the Excel application if you have already closed the workbook.
After you close the workbook you need to destroy the workbook object.

VB Code:

myBook.Close
Set mybook = Nothing
Application.Quit