UPDATE: I solved it. By deleting the \AppData\Local\Origin\Web Cache folder, then restarting Origin twice, the problem seems to be solved.
I have also tried all the steps outlined by the original poster and it hasn't helped.
I cannot reinstall because I'm using Windows Vista SP2 64-bit and your new installers require Windows 7. I was told by EA (https://help.ea.com/en-us/help/origin/origin/operating-system-not-supported-by-origin/) that I would still be able to play and download my games with Origin even after Vista support has been dropped for new updates.
Any help would be appreciated.
