Operating System: Windows XP
Burning Software: Nero
Anti-virus Software: Norton
DAEMON Tools Version: 3.46

I just noticed it wouldn't let me install Windows Service Pack 1 with Daemon Tools 3.46 Installed. It wouldn't work until I uninstalled Daemon tools. The error it was giving me was that it could not install service pack 1 because a file was open or in use by another program, the file was atapi.sys. I just thought I would pass that on if others are having problems installing Windows XP Service Pack 1, to uninstall Daemon Tools 3.46 to install that, then re-install it after the update.