Revo Uninstaller

I just uninstalled some unwanted software using the Revo Uninstaller (Rhapsody which came with an mp3 player I just got and decided I didn't need this software). Revo was recommended to me by some members here, so I have a few questions. The first screen that come up has a list of "modes" (Built in, Safe, Moderate and Advanced). As you probably know, the "Moderate" mode is ticked by default, so that's what I used. In the process some files came up to be deleted (which I assume were temp files associated with Rhapsody), so I ticked them all and deleted them. Then a registry entry came HKEY something, don't remember what, and then a file attached to it. I didn't know whether to select both HKEY and the file, so I left that alone. When such an option appears, do you just highlight the file or everything,including HKEY, I'm not sure if it was Local Machine, Users or whatever (should have made a screen shot). At any rate everything seems to be running OK. Is Revo smart enough to only delete unneeded files and what mode is recommended?