The version of defrag that comes with most recent installs of Windows does not allow for scheduling...to get around this limitation, the following VBScript will enumerate all fixed harddrives on a machine, and launch defrag via command like for that drive. Set it up as a scheduled task and forget about it.

'* Copyright (C) 2004 Andrew Loree
'* $Id: defrag.vbs,v 1.2 2004/06/04 11:59:39 andy Exp $
'****************************************************************************
'* defrag.vbs - Enumerates all fixed hard drives on
'* running 'degrag {drive_letter} -f' to defrag the drives
'* from a commandline.  Create as a scheduled task
'****************************************************************************
'*  This program is free software; you can redistribute it and/or
'*  modify it under the terms of the GNU General Public License
'*  as published by the Free Software Foundation; either version 2
'*  of the License, or (at your option) any later version.
'*
'*  This program is distributed in the hope that it will be useful,
'*  but WITHOUT ANY WARRANTY; without even the implied warranty of
'*  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
'*  GNU General Public License for more details.
'*
'*  You should have received a copy of the GNU General Public License
'*  along with this program; if not, write to the Free Software
'*  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
'****************************************************************************
'* Version History:
'*	1.0 - Initial Release
'*	1.1 - Added a trailing colon to the drive letter
'****************************************************************************
Option Explicit
Dim oShell, oFS, oDrive, nResults

	Set oShell = CreateObject("WScript.Shell")

	Set oFS = CreateObject("Scripting.FileSystemObject")
	For Each oDrive In oFS.Drives
		If (oDrive.DriveType = 2) Then
			nResults = oShell.Run("defrag " & oDrive.DriveLetter & ": -f", 1, TRUE)
		End If
	Next

	Set oShell = Nothing

Attachment	Size
defrag.vbs	1.68 KB