AIV Reminder is a nice tool that you can use as a reminder. With this program, you can set alarms to be activated at any time you schedule them. AIV Reminder will also let you to set an alarm and run a program instead of playing a sound, at a specified time.
When you are going to set an alarm of an important event, you have to do it manually, I mean, you have to enter the day, month, year, hour and minute and also you will need to specify the text message of the reminder. If you want, you can leave the box blank, because the message is optional, but personally, my advice is that if you don't want to have any trouble when you set multiple alarms, it's better to write texts, so you will remember for what you are reminded of.
One great feature of AIV Reminder is that you can use your own file sounds when the alarms are being displayed. Usually, other reminder programs show a splash screen with a message, but with AIV Reminder you can hear your favorite song as an alarm, or if you want, you can record your own voice and use it as a reminder. The sound formats accepted are WAV and MP3.