859janie The game didn't "lose" your graphics card. You get one "unrecognized graphics card" message for each new Options.ini file, after which the message is suppressed. A new user folder means a new Options.ini, so you saw the message again. As a side note, I can help you get your GPU recognized if you want, but that doesn't have anything to do with the current issue.
If you'd still like to try to fix it, please provide a dxdiag. Click Windows key-R, enter dxdiag in the run box, wait for the scan to finish, click "Save all information," and save the file to your desktop. From there, you can attach it to a reply using the paper clip (Attachment) icon included with the other formatting buttons.