You can use the AT command that comes with NT;
AT [\\computername] time [/INTERACTIVE] [/EVERY:date[....] | /NEXT:date[....]] "command"
Type AT /? in a cmd window to get a full description of this command. Note, it must be used in conjunction with the NT task scheduler.
There are other tools available, but this works, with a bit of playing, and you've already paid for it ;-)
I hope this helps