Site suddenly redirects to: wp-admin/install.php

My website suddenly redirects to wp-admin/install.php – as if it was a new install! I cannot get to my dashboard.

I had the dashboard open in several taps, as i was working on a few things. I posted a new post, and then posted it around on FAcebook and G+ and then all of a sudden, the links all added “wp-admin/install.php” to the end. Even when I clicked something from within an open dashboard tab, the same redirect. Weird. Anyone know what i need to do, or what happened? My Config file looks fine. Hmm…