Basic VBScript scheduled task

i'm trying to create a script to revert the screen saver on a computer every five minutes (so as to keep people from changing the screen saver on a display computer, without limiting their ability to examine it)...

I have the reverting part down, but the AT command doesn't seem to produce a scheduled task...

here's the code:

Code:

---

'*******************************************************
'* Script that resets screensaver                      *
'* for security purposes                              *
'*                                                    *
'* Author: Scobee                                      *
'*                                                    *
'* Date: August 23, 2008                              *
'*                                                    *
'* Desc: place in startup, to reset screensaver        *
'* every 5 minutes                                    *
'*******************************************************


Option Explicit

On Error Resume Next


Const saver = "C:\WINDOWS\System32\logon.scr"



'Creating objects and variables

Const HKEY_CURRENT_USER = &H80000001

Dim WSHShell, RegKey, ScreenSaver, objReg, lastscreensaver

Set objReg = GetObject("winmgmts:\\.\root\default:StdRegProv")

RegKey = "HKEY_CURRENT_USER\Control Panel\Desktop\"

objReg.SetStringValue HKEY_CURRENT_USER,RegKey,"LastScreenSaver","None"

Set WSHShell = CreateObject("WScript.Shell")


'Sets the screensaver to the default XP screensaver...

WSHShell.RegWrite regkey & "scrnsave.exe", saver

'...then saves this as the last used screensaver

WSHShell.RegWrite regkey & "LastScreenSaver", saver



'makes this script run every 5 minutes

Dim rTime, hourInt, minInt
rTime = Time()

'get AM or PM from the time
myAMPM = Right(rTime,2)

'get Hour and Minute
myColon = instr(1, rTime, ":",vbBinaryCompare)

IF myColon = 2 THEN
    myHour = Left(rTime,1)
    myMinute = Mid(rTime, 3, 2)
ELSE
    myHour = Left(rTime,2)
    myMinute = Mid(rTime, 4, 2)
END IF

hourInt = CInt(myHour)
minInt = CInt(myMinute)

IF minInt >= 55 THEN
        hourInt = hourInt + 1
        IF hourInt > 12 THEN
                hourInt = 1
        END IF
        IF hourInt = 12 THEN
                IF myAMPM = "AM" THEN
                        myAMPM = "PM"
                ELSE
                        myAMPM = "AM"
                END IF
        END IF
        minInt = 0
END IF
IF minInt < 55 THEN
        minInt = minInt + 5
END IF


'concatenate the time
myTime = hourInt & ":" & minInt & myAMPM


Set ObjShell = CreateObject("WScript.Shell")
dim shellText
shellText = "AT " + myTime + " " + Wscript.ScriptFullName
objShell.run(shellText)
Set ObjShell = nothing

---

any ideas?

Could you not just restrict their access to the registry key or through policies?

not really, they're demo computers at an electronics store I work at... The customer needs to be able to fiddle around and test things out (e.g. try different screensavers or wallpapers), but we don't want the changes to stick... that way, we don't have to deal with obscene wallpapers, screensavers, or the ubiquitous "all your base are belong to us" marquee.

I've already patched the registry to ignore bat files and only run vbs files from the administrator account, but I need to be able to revert screensaver and wallpaper on a regular basis... this is the first step, I will add wallpaper control later (once I work it out)

anyway, how can I get this to work?