Reminder Program Which Can Be Minimized To Tray

I have to take medication twice a day, and I tend to forget to take it. Now, I'm always at my computer, when I'm not working, so in the past I always set up outlook to give me notifications twice a day that I needed to take my meds.

Since having to do a clean install of vista, I'm having some problems getting outlook (the whole of office actually) to install properly. The only thing which really works is word, which is basically all I need, apart from the notification thingy of outlook. Also, in the past I noticed that outlook was kind of eating up some resources, and caused some problems if I just left it running all the time. As I use gmail, I didn't have it set up with a mail account, and it kept asking me to set it up, at least twice a week. Anyways, I would prefer not to use outlook anymore.

So right now I'm temporarily using windows calender (or agenda, as it's called in the dutch version), but it can't be minimized to tray. Now, it has the advantage of giving me a notification even if I haven't turned it on. Unfortunately though, it only does so once. If I close the program after I've received a notification, it then no longer notifies me for the next time I need to take my meds.

So I was wondering if anyone knows a (preferably free) program which can give me 2 notifications per day, at preset times. The program needs to not take too many resources, and needs to minimize to tray.