"We've determined this problem occurs on AMD-based machines with Windows XP images that were originally captured by an OEM on an Intel-based machine," said Microsoft in an anonymous post to its Micrososft Update team's blog . "The problem is a registry value, present on images created with Intel processors, that causes a driver (intelppm.sys) to load at boot. When intelppm.sys attempts to load on an AMD-based system upon the install of SP3, it causes a blue screen and the continuous reboot."