Hello nowwhatnapster,
If you get your refund thru PayPal, destroy the nongenuine materials and throw them out.
Regarding the second purchase, I would do a clean installation with those materials, too, and then run the mgadiag utility http://go.microsoft.com/fwlink/?linkid=52012 and post the results here so we can check to see if those are genuine or nongenuine.
For great advice on all topics XP, visit http://www.annoyances.org/exec/forum/winxp