A family of Microsoft relational database management systems designed for ease of use.
There is also the possibility to use Windows (the OS) Task Scheduler.
In your Access application, define a Macro which would initiate the operation you are interested to perform.
In the task scheduler, run: MSACCESS.EXE YourDatabaseApp.accdb /X YourMacro
and select the time of the day you want that macro to be executed.
You only need MS Access for that solution, and some know-how about your OS. Under Vista, simply make a Start Search on Task Scheduler.