Multiprocessor free OS with Dual Core?

I have a DualCore Intel Pentium D 945 3415Mhz CPU but I am using a windows xp pro Multiprocessor free 32 bit version. Does this mean that I am utilizing only one processor right now? Should I upgrade my OS?
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  1. No, your OS is fine and if you have more than one core it will be utilised.
  2. Just for future reference:

    Processor = the actual CPU, regardless of how many cores are in it
    Core = processing unit in the CPU, single core CPUs have 1, dual cores have 2, quads have 4, and so on.

    Also, like the monkey said, you're fine.
  3. Thanks for clearing that up for me.
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