when you uninstalled fallout did you manually delete the data folder? if not its why nmm picked them up after reinstalling. uninstalling the game via steam wont have touched any of the mods installed via nmm as steam will only delete main game files, not any addition files in the install folder. any enbs, dll loaders and mods will stay there. However, this sounds more like an input issue. remove all USBs excluding mouse and keyboard and see if the problem persists. if it does then try changing the ports they are plugged into. if this fails, then i would do a clean install. Uninstall via steam, uninstall NMM. manually delete the left over fallout folder and manully delete all of the INIs from your users files.