Well i was having the same problem with DT and the sptd.sys system hang at boot. Since i had a Norton ghost backup that didn't have deamon tools on it since i recently reinstalled, i restored my backup image. Then when i was ready to install DT i went to http://www.duplexsecure.com/ to download the latest sptd version and rebooted my computer.
Everything booted up fine. So i went to install daemon tools and made sure it does not start up with windows. Now everything works fine.
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