Okay, you'll always have some of this issue, it is part of the nature of
Windows and how it gobbles memory. XP is especially, graphics intensive and
while XP can work fine with even less graphics memory than 32MB, you should
have at least 64MB and if you are gamer, nothing less than 128MB.
You can try turning off some of the eye candy but given the overall
horsepower of your system, a beefier graphics card might reduce some of this
issue. As I said, it won't eliminate it but the memory you have on the
card, the less of this you should see. Obviously, if you have a lot of
things open at once and if at least one or some of these items are
themselves graphics intensive, as you close and open items, you will see the
desktop refresh.