It sounds like the release of Daemon Tools you have is incompatible with Vista. What version number are you using?
Daemon Tools 3.47 (0.5 MB) is recommended HERE
Note that site indicates that version 4+ has spyware embedded.
"The great majority of mankind are satisfied with appearances, as though they were realities, and are often more influenced by the things that seem than by those that are." - Niccolo Machiavelli