There are a couple of ways to accomplish this.  How you do it depends on the
nature of your application.  One way would be to have a routine in your
startup form that would check the day of the week, have a way to know if the
current week's reports have been run, and run the reports.

If you require unattended production of the reports, you could create a
separate mdb that would launch your reports process and have that application
run from Windows Event Scheduler.