Scheduling a job in AT

I am trying to schedule a job in AT, and AT won’t run the job. The job is opening an Access database. I have the job in a batch file and the batch file runs fine when run at the DOS prompt. I can schedule the job to run in AT, but when the scheduledtime comes around , nothing happens in AT. I have tried this on both an NT server and an NT workstation. Neither one will run it. I do have other jobs running in AT and they run fine. I’ve checked the “LOG in AS” on the scheduler service, but it won’t let me change it. It is set to log on as system account. Any suggestions?