Right-click that program's config hive, export. Move file to new system, merge. I did this very frequently before PowerShell got amazing support for the registr

Right-click that program's config hive, export. Move file to new system, merge. I did this very frequently before PowerShell got amazing support for the registry (seriously, it's the best. Tab completion of registry values in get-childitem if you supply a registry path). > ...accretes trash If your app doesn't remove it's old settings when uninstalled how is that a problem for the registry to solve? It happens with /etc also. > hard to weed it out Search for the hives if you don't know where they are. Right-click the hives in question, delete. Registry usability got leaps and bounds better in Windows 7, and again in Windows 10. Most registry problems you hear about are holdovers from the bad old days (XP and older).