Hello. I was running eSET anti-virus up until Wednesday 03/11/2021. I uninstalled it and installed the Kaspersky Total Security software. However, I’m since unable to open pDF files. I tried repairing/re-installing the Adobe Acrobat X Pro, but that didn’t help either. Windows 10 version - 21H1 (OS Build 19043.1288) Kaspersky Total Security - 21.2.16.590 © As I mentioned in my subject, I don’t receive any error messages, and the only Adobe related process running on my task manager after I click on the file is (attached: ss1). The anti-virus change is the only major software addition/change I’ve done on this laptop since about a year now (it’s a work laptop). I’m still not completely certain the issue is with KTS, but I want to make sure it’s unrelated. Thanks, Sid