My Q9550 is not using all 4 cores


in task manager it shows that I am only using 1 core, however when I try to change it in msconfig I cannot change it because only one is displayed

any help would be much appreciated.
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More about q9550 cores
  1. Uncheck the box and reboot, see if it solves it.

    But what Mobo are you using?
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CPUs Core Task Manager Msconfig