can SP2 on Windows XP Professional cause my product to appear invalid. It
was purchased from Comp USa and so I know it is valid.

SP2 will not cause you computer to appear invalid.

Before doing anything, if you're concerned -
Two Ways to Find Out if your Copy of Windows is Genuine
http://www.microsoft.com/resources/h...s/default.mspx

--
===========================
TaurArian [MS-MVP] 2005-2006
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"perplexity" <perplexity @discussions.com> wrote in message
news:E0CC7439-2C97-42C7-863F-(E-Mail Removed)...
> can SP2 on Windows XP Professional cause my product to appear invalid. It
> was purchased from Comp USa and so I know it is valid.