cpf and cpu usage

I installed version 2.4 on 2 computers. The laptop running with win2K has no problems - works well. The installation on the other computer running WinXP pro creates cpu usage problems. cpf uses anywhere between 12 and 20 %, sometimes as high as 27 %, and System uses the almost all of the rest. System idle process is zero. Without cpf or with zonealarm pro, there is very little cpu usage. I have tried uninstalling and reinstalling the program 3 times, cleaning out the registery each time to no avail.

Any suggestions would be appreciated

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