Hi najat,
Thank you for reaching out.
Sorry to hear that Acrobat is freezing and becoming unresponsive. I understand how frustrating it can be, especially when you're unable to open important PDF files. Please try the troubleshooting steps suggested here: Acrobat is not responding.
If you continue to experience the same issue, please try reinstalling the application using the following steps:
Uninstall the application and run the cleaner tool from the following link: Acrobat Cleaner tool. Ensure that you empty the trash folder.
Reboot the machine.
Install Adobe Acrobat from the following page: Install Acrobat.
Please let us know how it goes.
Thanks,
Meenakshi