ACPI uniprocessor pc

I don't know how to put it, but here it goes . I had a opitplex gx280 and i had to reinstall Windows xp because some things went wrong, anyway so once i reinstalled Windows xp on my Opitplex i noticed that on my Task manager i could not show two CPU graphs so i went into Device manager and noticed in the My Computer bit, it says ACPI uniprocessor pc(Adanced Pehipheral Interupt Control) , so i Googled it and it said to allow hypertreading in BIOS, so did and it worked fine after that Now i have another computer with a AMD Athlon(tm) XP 3000+ 2.17GHz and in the device manager it says ACPI uniprocessor pc. So before i go and do somthing with my computer i decided to send this question and ask you for some advice Shell i leave it alone?

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