Try http://www.recoverytoolbox.com/dwg.html for repair .dwg files. The utility can't modify source data during restoration. The program starts under low system requirements and any system configuration. It has easy to use, intuitive interface is suitable for any experienced user.
I've known only some interesting utilities for managing like issue. One of them is the next program, which was found couple weeks ago. The program proved it quality and forced to understand that it is able to resolve many other similar problem also -...