Every time I try to log in, in-game, in the launcher, or on thesims3.com, it will read a red error message above the login that says either "Invalid login information. Please try again." or "Not logged in." I've tried logging in from another person's computer, and it works just fine. Any ideas about what is causing this on only my computer, and how I might be able to fix it?
Try clearing your IE browser caches. The launcher is somehow connected to the IE Browser.
Also try starting the launcher as administrator.
I don't work or have any association with EA. I give advice to the best of my knowledge and cannot be held responsible for any damage done to your computer/game. Questions belong in the forums. I don't answer questions via PM.