Unable to sign in through Facebook on Spotify desktop app (Windows Vista)

[allie_pocket]

It was working well up until a few days ago. I accidentally signed out and it hasn't let me sign back in since. I've tried rebooting the PC, which is Windows Vista, and reinstalling the current version of Spotify. Spotify works fine on my iPhone and work computer, and I'm always signed in on those devices. Anytime I click on the Log-In using Facebook option, it gives me this error message page: https://www.spotify.com/us/static/login-error/. I've contacted Spotify's support through Twitter and they advised me to 1) Reboot and redownload. 2) Keep the Facebook page open on a browser window. So far, nothing's helped.

Asking for a friend.