Have you thought of using the command line instead. The AT command can do remarkable things.
The AT command schedules commands and programs to run on a computer at
a specified time and date. The Schedule service must be running to use
the AT command.
AT [\\computername] [ [id] [/DELETE] | /DELETE [/YES]]
AT [\\computername] time [/INTERACTIVE]
[ /EVERY:date[,...] | /NEXT:date[,...]] "command"
\\computername Specifies a remote computer. Commands are scheduled on the
local computer if this parameter is omitted.
id Is an identification number assigned to a scheduled
/delete Cancels a scheduled command. If id is omitted, all the
scheduled commands on the computer are canceled.
/yes Used with cancel all jobs command when no further
confirmation is desired.
time Specifies the time when command is to run.
/interactive Allows the job to interact with the desktop of the user
who is logged on at the time the job runs.
/every:date[,...] Runs the command on each specified day(s) of the week or
month. If date is omitted, the current day of the month
/next:date[,...] Runs the specified command on the next occurrence of the
day (for example, next Thursday). If date is omitted, the
current day of the month is assumed.
"command" Is the Windows NT command, or batch program to be run.
More complete help file are available by running the command:
from either a command window or the Run box.
A sample valid entry is:
AT 13:45 /every:M,T,W,Th,F,S,Su "C:\Documents and Settings\Owner\My Documents\Donfiles\Batches\BACKUP2.BAT"
That's all that's necessary to run my backup daily @ 1:45 pm, forever or until I choose to stop it. Much simpler that fooling with the GUI Windows Task Scheduler. It can run any executable program or if you need to open some file, it can run the command interpreter first and then open whatever you choose, without any interaction from you. I have no application for that feature but it's there if you do.
I think XP Pro may have an even better command called schtasks
but alas, it isn't on my XP Home. It is able to deal with passwords without user interaction. Schtasks Command line reference