Mass effect 2 help!

I moved all files and folders.. but it doesn’t make sense. It worked when I switched to user with no game content. Even after I deleted all the files and uninstalled the game, under user, it still didn’t work. I honestly think that something in the game is corrupted. Would a different key help? My original key that I got for the trilogy, never worked and that’s basically what started the whole thing. When I bought the trilogy, I had to get help right away because apparently the key that came with the game, somehow was already in use and I had to contact support and had them give me a different key just so it’d work. As of right now, I have no game content or files on my pc. No profiles. So I’m not sure what to do. Game 1 and 3 work but not 2. I’ve alsi read that there’s been cases where people have said that one of the games never works. It’ll be 1 and 3 that’ll work and not 2. Or 2 and 3 will work and not 1. I also think that part of the issue is the type of system I have. It’s not compatible with the games in general and it’s a pain in the butt to get it working.