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To start with, I have heard that you should have at least 1GB of RAM to run Windows Vista. And it always helps to have more memory. But I doubt that is the specific cause of this slowness. Another hardware option I read about was to get a faster hard drive. Upgrade from a 5400rpm drive to a 7200rpm one will give you some gains. That also did not seem to be the root cause.
I plan to review how Windows works, and what might make a system slow. Then I can try these things out on this machine.