ok, are you doing this using macros or are u using visual basic software, if u are using the software u need to create instances of excel.application and maybe even excel.worksheet also.
eg.
Dim WithEvents XL As Excel.Application
Dim WithEvents Wb As Excel.Workbook
Dim WithEvents ws As Excel.Worksheet
To close these instantly say attaching this cose to a button all u have to do is put the code in i suggested, u could alos just put in this to make it easier:
XL.DisplayAlerts = False
XL.Quit
XL.Visible = False
Set XL = Nothing
Set ws = Nothing