I have had the same problem just download Duplex Secure's SPTD driver which probably installed in Deamond Tools install it and unistall it (recommended to unistall Revo Unistaller)
SPDT download:
http://www.duplexsecure.com/en/downloads
Revo Unistaller download:
http://www.revouninstaller.com/revo_uninstaller_free_download.html