Matlab doesn't recognize processors.

2015 9 14
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I have windows xp(x32) and 2 processors Intel Pentium 4 3,20 GHz.
I set "parallel/manage cluster profile/number of workers =2" , run "validate"and test is OK.
I edit:
feature('numCores'); % local processors
1
getenv('NUMBER_OF_PROCESSORS') %windows processors
2
If I run "matlabpool" it tell me:
>> matlabpool
Starting matlabpool using the 'local' profile ... connected to 2 workers.
>>
but
feature('numCores');
always return 1.
Can someone tell me why?

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