When you first install it, you can launch it fine, and the splash screens shows, but that’s it. The process is listed for a second and the whole thing disappears. I’d read one some site that it involved extracting the installer and making a copy of the JRE. Maybe this is true for some folks, but all it seemed to take for me was to go into the properties for the binary (ZDE.exe) and choose “Vista”. That’s it!