PS: The guide below refers to Windows 7.
1) Go to 'Start' -> 'All Programs' -> 'Accessories' -> 'System Tools' -> 'Task Scheduler' (or 'Scheduled Tasks' for WinXP)
2) Click 'Create Basic Task...'
3) Enter a Name and Description for your own reference later.
4) Select whether you want to schedule it to run daily, weekly, or just one time.
5) After that, specify the date and time for your program to run.
6) Select 'Start a program'. (You may choose Display a message to show a pop-up reminder)
7) Browse to your program executable. Here I chose my beloved uTorrent :)
8) Finally, check everything is correct and click 'Finish'!
At any time, you may check your scheduled task by opening Task Scheduler and click 'Task Scheduler Library'. Your task will be listed there with the name given by you in Step 3 above.
