Do not use a timer for this purpose. It presupposes that Access is open at the intended time, which might not be correct.
Write a macro that either runs a query or runs some code (or both) to accomplish your goal. Debug the query/code combo until it does what you want when you run it by hand.
Then use the WINDOWS task scheduler to activate Access. You should search this forum for how to activate a macro from a command line. It is the /X {macro name} switch that will do the job for you.
Basically, you create a shortcut icon for Access and your indicated database. Edit the icon's command line to include the /X macro-name data. Then tell Windows when you want this run.
Unfortunately, given the stability of Windows long-term, I have no greater confidence in this method than JonH did in using purely Access facilities to do the same thing.