Windows XP SP3 fresh install and security updates all up-to-date with nothing else loaded. Install latest Avast 6.0.1125 first before anything else. Upon reboot of Windows XP and during login, the system crashes to the blue screen of death. It cites aswSnx.SYS and aswSP.SYS as the culprits. Please see the attached screen capture (sorry for the poor quality). Safe boot uninstall of Avast resolves the issue, and the system will boot up again.