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If you need to recover it as fast as it possible install Recovery Toolbox for DWG , this thing is able to help you. But it's not free. Download free demo here:
As one of solutions I can advise you to try to open your files in MS Visio, Compass or using another program which could open dwg file. Or try to recover them using AutoCAD recovery function.
Also you can read here about dwg file corruption:
Note: A fatal error can be caused by DisplayLink Core software. If you have this installed on your system, try uninstalling it and then see if this resolves the issue. Additionally, some antivirus or desktop locking programs can cause errors in AutoCAD as they lock the system environment from working. Your antivirus may even need to be uninstalled.