Hi,
It sounds like the issue that you've hit is due to not selecting the relevant Java version in the second step of the install process, so when DM install is finalised everything is set-up correctly so that the runtime works okay.
Try re-downloading and install over the top of itself (though don't forget to right click the .exe install file and set compatibility mode to Windows 7) and follow the stages but ensure you select the relevant JRE version.
I hit the same issue, and this worked for me, though I haven't attempted to uninstall.
Good luck!!!
