Cannot close WorkBooks ...

[rookie7799]

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

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