You're welcome. As you suggested in your first post, one of the best ways to "completely" uninstall a program is to use Revo Uninstaller. Here's how to uninstall Dropbox, even if it came with your PC:
Uninstall Dropbox - Dropbox
Regarding deleting registry keys with Revo Uninstaller, here's what the instruction manual says (Condobloke had shared the link earlier!):
Pressing Scan button will trigger scanning for leftovers and the results (if any) will show up automatically. Revo Uninstaller shows found leftover Registry items first. Registry keys and values found as created by the uninstalled program are in bold. Not bold keys are considered as not created by the uninstalled program. You can also check mark them but they will not be deleted! They have check mark options just because it is easier to select the top parent and automatically check mark its sub items – no need to go through all of them and check mark them separately, so, whatever you check mark, when you press Delete button only check marked bold items are going to be deleted, even when Select All button
Edited by bwv848, 30 December 2016 - 07:07 PM.