its not an installation
its a corrupt =database
sometimes there fixable other times not
go back to a back up, and restore whatever changes you made. You MAY be able ot import objects from the corrupt dbs.
if you havent a backup, try opening a new dbs, and see if you can import objects.
if you can, do a few objects at a time, making sure the corruption doesnt appear again, and make additional copies as you go. It may just be one corrupt form doing this.