What you have to do on that page is select "Get Latest Drivers" (Under Graphics Support heading) You will then have a list of operating systems to choose from, select your OS (XP home I presume?), this will then populate the next box with a list, this is possibly where you went astray, you don't select Radeon, you select "Integrated/Motherboard", when you do this it will populate the next box with a list and voila, you will find "Radeon Xpress 200" on it.

I must admit, it is a bit confusing because you naturally select "Radeon" from the second list, but your graphics isn't handled by a card as such, it's part of the motherboard's chipset hence why you select "Integrated/Motherboard" instead. It's not obvious at all, I couldn't find it myself at first.

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Lawrence