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Windows XP Service Pack 2 is usually a good thing. However, it's not without it's problems. Most notably is it's crashing of more 'sloppily' written drivers. If you're now experiencing the BAD_POOL_HEADER Blue Screen Of Death on bootup and have a NetGear wireless network card in your machine, then remove it. More than likely this will allow you to boot. I've also heard of some LinkSys wireless network cards causing this same error as well. As of the writing of this article, there are no new drivers from either LinkSys or NetGear. I've also been unable to find any support on their site about the issue. If your NetGear card uses the Atheros chipset, then you may be able to use those drivers to get back up and running.
from a quick scan looks like it has to do with older NIC drivers....