Digital Editions doesn't complete uninstall of registry data

Digital Editions (4.5, in this case) leaves keys and data in the Windows (7) registry after uninstalling the software.

I've had some luck getting ADE working again with "sideloading" library books by searching and removing ADE components in the registry before reinstalling the ADE package, but I risk damaging my OS installation with such a "hit-and-miss" method.

Maybe there's a batch file procedure for cleaning ADE completely out of a Windows system?