If what 'webworkings' suggests doesn't work. Here's what i would do (although i'm not sure why you want it back to factory settings):
Download and install something like 'advanced system care' (free version ). In the toolbox of that software you will find IOBit Uninstaller .... use it to uninstall all unwanted software ... after it does the 'standard' uninstall, it will ask you if you want to remove all traces of that program ... click yes and it will remove all the registry settings and hidden bits that that software has installed.
thinking of the user's data ... just go into all the folders past the user name (for instance ... my documents, pictures, videos etc.) ... select all and delete.
I'm not suggesting that doing this is as good as a 'fresh install' but ... maybe it's close enough to get you where you want to be with the laptop and it wouldn't take too long to do?