If you are running XP service pack 2, you still need to download the windows update that fixes dual core issues. I don't know the number of the update offhand, but if you update your system to current, it should start working properly. You could even download XP SP3 and install that to see if it helps. It will include all updates for SP2.
There are some other ideas I can think of for you to try, but you should do 1 step at a time. I am still working to resolve a certain odd dual core related issue of my own. And I will be writing a good list of possible fixes for dual core problems if/when I get my issue resolved...
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