You have hit the idm admin URL and you are redirected to the Configure: Import exchange file page? Did this ever happen to you? A snapshot of that looks like this.
Reason: Your IdM is unable to locate the database, if someone has removed your database or something of the same sort has happened then you see this page.
Solutions:
1. Recover your database
2. If its ok to have a fresh identity manager i.e. if you lose nothing, then just import the init.xml from idm-installation-dir\sample\init.xml