The at command runs using the permissions of the Scheduler service. Open services in the control panel and change the account that the scheduler service is running as. Re-start the service and all should be ok.
The other option is to update to IE 5.5 or higher and update to the Task Scheduler. To do this you need to do a custom install of IE and select it manually.
Once done the each of the tasks can be assigned to run as a particular network account, thus it doesn't matter which account the service runs under.
Clear as mud? I hope not... Cheers,
Sam
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