Processors (number of) Supported in XP

Windows XP Home :                                                 1 processor (Normal and HT)
Windows XP Pro:                                                      2 processors (Normal and HT)
Windows Server 2003 Standard:                               4 processors
Windows server 2003 Enterprise:                              8 processors
Windows server 2003 Datacenter:                            32 processors

Product Key

Q: I am reinstalling Windows XP and I am using the product
key off the bottom of the laptop but it says it is no good, what can I do?

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