What tool can give me a hourly reminder?

Question

I'm looking for a tool, that can alert me every hour with a popup and a message (like "take your medicine..") I'm running Windows XP.

Answer 1

Control Panel -> Administrative Tools -> Task scheduler.

Create task (at the right) :
Name: Medicine
Desc: whatyouwant
Trigger tab: NEW

Begin: on a schedule
Settings: Daily
Advanced settings (bottom):
Repeat task every: (set it however you want) 1 hour | for a duration: Indefinitely

Actions:
Display a message
Title: Medicine
Message: Take your medicine.

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Screenshots:

      

Answer 2

For Gnome there exists a Timer Applet which provides such (or very similar) functionality.