XP64 Only showing one core when Ive a dual

[area51_for_psx]

Hi guys my xp64 is only showing single core but ive a dualcore chip. Is there anyway of getting xp to see it without having to reinstall? Yeah its an intel chip

 

[area51_for_psx]

Nope was a clean install and did work. Install has been on a good while and have just noticed today one core has dissapeared.

 

[area51_for_psx]

Yeah its set to that.