Rebuilding WID Database for WSUS in Windows Server 2012

If you're using Windows Internal Database (WID) for WSUS in WS2012 and you think you've screwed the configuration, you can force the WSUS to rebuild its contents and database.

Steps:

1. Remove WSUS and WID roles from server manager. Reboot server.
2. Go to C:\Windows\WID\Data
3. Move both "SUSDB.mdf" and "SUSDB_log.ldf" to another temp folder
4. Re-install WSUS server role again

Found a comprehensive guide on http://prajwaldesai.com/troubleshooting-wsus-3-0-sp2-on-windows-server/