PDF files have been opening fine since buying new Toshiba laptop back in September. Now, when trying to open and read an existing PDF file, it locks my laptop whereby I must power off to restart. What happened?

Hi jeffm52816504

Please provide the exact dot version of the software & OS installed at your system .Also check whether is there any update available for the software after going through "help > check for updates "

Follow this thread to reset the preferences for the Acrobat software:- How to reset Preference settings in Acrobat.

Please refer to this article :- Troubleshoot Windows system errors, freezes | Adobe software

Also check with the different user account with Admin rights to replicate the issue .

Let me know if it works.

Regards,

Yatharth