Re: How do I rid my ME3 game of mods I installed years ago?
Relax, you can uninstall and re-install and you won't lose any of your ME3 multiplayer "stuff". It should get rid of all the mods.
And single player files are saved in a separate (not install) folder, so they should be safe as well.
Might be best to also enable cloud saves (Origin>Application Settings>Installs & Saves>Cloud Storage)
I'm no expert, though I have installed multiple times (probably >10 by now?)
You can uninstall from Settings on the ME3 game page (gear symbol). But you might want to check that folder afterwards to ensure all is removed. Then re-install. Not sure if just a "repair" will do.
You can change your username as well, with or without changing email address. Bottom left of Origin, click your name/icon and go to "EA Accounts & Billing". Edit your "Basic Information"