Occasionally the need arises for you to schedule a task, even more occasionally you want that task to run frequently. Windows idea of frequent is daily, when you add a task it isn't overly obvious that you can schedule a task to run hourly etc. You can.

Start -> All Programs -> Accessories -> System Tools -> Schedule Tasks

File -> New -> Scheduled Task

Give the task a name

Open it

Set what you want the task to do and then flip to the Schedule tab.

Click the advanced tab and set how frequently you want the task to repeat and for how long (Duration), for example every hour for 24 hours. Ok that screen

Now back in the Schedule tab set the start time to a time a little after the current time, a minute or two.

Ok everything

Watch the task begin and then run to your schedule.