Probably something happened in your system that has corrupted the AutoCAD installation.
I would suggest you uninstall and reinstall it again to reset the correct functionality of the program.
In the meantime, you can create a shortcut in your desktop pointing to the file acad.exe located in the AutoCAD installation directory.
Regards
Antonio Barroca
Autodesk Product Support
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Antonio Barroca
Product Support Specialist
Autodesk, Inc.