You don't need a special program to change the cores. I used to have that problem all the time and the easiest way to fix it is by doing the following:
Start EQ
Alt-tab out to the desktop if playing in full screen mode
Right click on your task bar and go to Task Manager
Go to the Processes tab along the top
Find the process with an Image Name of eqgame.exe (Click directly on "Image Name" to sort alphabetically)
Right click on eqgame.exe, click set affinity
Uncheck all boxes other than CPU 0 and hit OK
Return to EQ and you should be problem free
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