Ok, it prob isnt the card but it could be the device drivers for the card, try downloading the latest drivers for the 6600GT from Nvidia. If its not that theres only one other explanation i can think of at mo. Windows XPs Service Pack 2 add on had a few problems with a background service called the 'Microsoft Indexing Service', it caused what is refered to as a Blue Screen of Death (BSoD) with the error STOP: 0x00000019 (parameter, parameter, parameter, parameter) BAD_POOL_HEADER Invalid Pool Header. So u could also try turning this service off by going to Start -> Run and typing services.msc. Now in the list that appears find 'Indexing Service' and double click it till startup type is Disabled and then restart the computer. If either of those dont work then im afriad im a bit stumped.
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