Windows registry is such a good place to get lost it's been used by many trial software to leave hard to detect marks there. Instead of trying to solve an impo

Windows registry is such a good place to get lost it's been used by many trial software to leave hard to detect marks there. Instead of trying to solve an impossible task like attempting to detect and remove "leftovers", it's more reasonable to prevent it from happening in the first place. Most programs don't even need installers and work after simply unpacking into a directory like a zip archive. For the rest, running programs in a sandbox like Sandboxie keeps their file and registry changes contained to a specific directory that you can simply delete. Coincidentally, it also makes all programs portable so you don't have to reinstall them when you reinstall Windows. But of course all of that is quickly growing irrelevant as Windows itself is becoming more and more of crapware.