Mass effect 2 help!

Basically I deleted all files( uninstalled and reinstalled ). Because twitters ea support said that the game worked on the user account with admin privileges, and they suggested I play the game on that other user account. So because I didn’t want to lose my progress, I transferred my saves files onto the user account. But when I did that, the game didn’t work. That told support that something was corrupted in my files. So after it didn’t work, I cleaned the games. Deleted all profiles and data. Basically starting from scratch here.

I have used the ccleaner in the past. Actually when I first got the trilogy about a year ago or so,  twitters support had me use that. After I used it, it made things worse. It not only corrupted some of my registry files, but it also corrupted the game as well. I had no choice to do a system restore to before I downloaded the cleaner. So I’m a little hesitant on using the cleaner this time around. I have also done a clean boot. I did a clean boot when I had this problem several months ago, and it came back with no issues, so I don’t think it’s needed again.